diff --git a/plugins/building-hacks.cpp b/plugins/building-hacks.cpp
index 60e6179cf..b9c9ea3c9 100644
--- a/plugins/building-hacks.cpp
+++ b/plugins/building-hacks.cpp
@@ -37,6 +37,7 @@ struct graphic_tile //could do just 31x31 and be done, but it's nicer to have fl
 struct workshop_hack_data
 {
     int32_t myType;
+    bool impassible_fix;
     //machine stuff
     df::machine_tile_set connections;
     df::power_info powerInfo;
@@ -76,8 +77,11 @@ struct work_hook : df::building_workshopst{
     }
     DEFINE_VMETHOD_INTERPOSE(uint32_t,getImpassableOccupancy,())
     {
-        if(find_def())
-            return tile_building_occ::Impassable;
+        if(auto def = find_def())
+        {
+            if(def->impassible_fix)
+                return tile_building_occ::Impassable;
+        }
         return INTERPOSE_NEXT(getImpassableOccupancy)();
     }
 
@@ -213,7 +217,7 @@ struct work_hook : df::building_workshopst{
                     }
                 }
             }
-            int w=db->x2-db->x1;
+            int w=db->x2-db->x1+1;
             std::vector<graphic_tile> &cur_frame=def->frames[frame];
             for(int i=0;i<cur_frame.size();i++)
             {
@@ -258,24 +262,32 @@ static void loadFrames(lua_State* L,workshop_hack_data& def,int stack_pos)
             graphic_tile t;
             lua_pushnumber(L,1);
             lua_gettable(L,-2);
-            t.tile=lua_tonumber(L,-1);
-            lua_pop(L,1);
+            if(lua_isnil(L,-1))
+            {
+                t.tile=-1;
+                lua_pop(L,1);
+            }
+            else
+            {
+                t.tile=lua_tonumber(L,-1);
+                lua_pop(L,1);
 
-            lua_pushnumber(L,2);
-            lua_gettable(L,-2);
-            t.fore=lua_tonumber(L,-1);
-            lua_pop(L,1);
+                lua_pushnumber(L,2);
+                lua_gettable(L,-2);
+                t.fore=lua_tonumber(L,-1);
+                lua_pop(L,1);
 
-            lua_pushnumber(L,3);
-            lua_gettable(L,-2);
-            t.back=lua_tonumber(L,-1);
-            lua_pop(L,1);
+                lua_pushnumber(L,3);
+                lua_gettable(L,-2);
+                t.back=lua_tonumber(L,-1);
+                lua_pop(L,1);
 
-            lua_pushnumber(L,4);
-            lua_gettable(L,-2);
-            t.bright=lua_tonumber(L,-1);
-            lua_pop(L,1);
+                lua_pushnumber(L,4);
+                lua_gettable(L,-2);
+                t.bright=lua_tonumber(L,-1);
+                lua_pop(L,1);
 
+            }
             frame.push_back(t);
             lua_pop(L,1);
         }
@@ -285,17 +297,18 @@ static void loadFrames(lua_State* L,workshop_hack_data& def,int stack_pos)
     lua_pop(L,1);
     return ;
 }
-//arguments: custom type, consumed power, produced power, list of connection points, update skip(0/nil to disable)
+//arguments: custom type,impassible fix (bool), consumed power, produced power, list of connection points, update skip(0/nil to disable)
 //          table of frames,frame to tick ratio (-1 for machine control)
 static int addBuilding(lua_State* L)
 {
     workshop_hack_data newDefinition;
     newDefinition.myType=luaL_checkint(L,1);
-    newDefinition.powerInfo.consumed=luaL_checkint(L,2);
-    newDefinition.powerInfo.produced=luaL_checkint(L,3);
+    newDefinition.impassible_fix=luaL_checkint(L,2);
+    newDefinition.powerInfo.consumed=luaL_checkint(L,3);
+    newDefinition.powerInfo.produced=luaL_checkint(L,4);
     //table of machine connection points
-    luaL_checktype(L,4,LUA_TTABLE);
-    lua_pushvalue(L,4);
+    luaL_checktype(L,5,LUA_TTABLE);
+    lua_pushvalue(L,5);
     lua_pushnil(L);
     while (lua_next(L, -2) != 0) {
         lua_getfield(L,-1,"x");
@@ -312,12 +325,12 @@ static int addBuilding(lua_State* L)
     }
     lua_pop(L,1);
     //updates
-    newDefinition.skip_updates=luaL_optinteger(L,5,0);
+    newDefinition.skip_updates=luaL_optinteger(L,6,0);
     //animation
-    if(!lua_isnil(L,6) && lua_gettop(L)>5)
+    if(!lua_isnil(L,7))
     {
-        loadFrames(L,newDefinition,6);
-        newDefinition.frame_skip=luaL_optinteger(L,7,-1);
+        loadFrames(L,newDefinition,7);
+        newDefinition.frame_skip=luaL_optinteger(L,8,-1);
         if(newDefinition.frame_skip==0)
             newDefinition.frame_skip=1;
         if(newDefinition.frame_skip<0)
diff --git a/plugins/lua/building-hacks.lua b/plugins/lua/building-hacks.lua
index 3431764f8..e0a5b1010 100644
--- a/plugins/lua/building-hacks.lua
+++ b/plugins/lua/building-hacks.lua
@@ -1,3 +1,109 @@
 local _ENV = mkmodule('plugins.building-hacks')
+--[[
+	from native:
+		addBuilding(custom type,impassible fix (bool), consumed power, produced power, list of connection points, 
+		update skip(0/nil to disable),table of frames,frame to tick ratio (-1 for machine control))
+	from here:
+		registerBuilding{
+			name -- custom workshop id e.g. SOAPMAKER << required!
+			fix_impassible -- make impassible tiles impassible to liquids too
+			consume -- how much machine power is needed to work
+			produce -- how much machine power is produced
+			gears -- a table or {x=?,y=?} of connection points for machines
+			action -- a table of number (how much ticks to skip) and a function which gets called on shop update
+			animate -- a table of
+				frames -- a table of 
+					tables of 4 numbers (tile,fore,back,bright) OR
+					empty table (tile not modified) OR
+                    {x=<number> y=<number> + 4 numbers like in first case} -- this generates full frame even, usefull for animations that change little (1-2 tiles)
+				frameLenght -- how many ticks does one frame take OR
+				isMechanical -- a bool that says to try to match to mechanical system (i.e. how gears are turning)
+			}
+]]
+_registeredStuff={}
+local function unregall(state)
+    if state==SC_WORLD_UNLOADED then
+        onUpdateAction._library=nil
+        dfhack.onStateChange.building_hacks= nil
+        _registeredStuff={}
+    end
+end
+local function onUpdateLocal(workshop)
+	local f=_registeredStuff[workshop:getCustomType()]
+	if f then
+		f(workshop)
+	end
+end
+local function findCustomWorkshop(name)
+	local raws=df.global.world.raws.buildings.all
+	for k,v in ipairs(raws) do
+		if v.code==name then
+			return v
+		end
+	end
+end
+local function registerUpdateAction(shopId,callback)
+	_registeredStuff[shopId]=callback
+	onUpdateAction._library=onUpdateLocal
+	dfhack.onStateChange.building_hacks=unregall
+end
+local function generateFrame(tiles,w,h)
+    local mTiles={}
+    for k,v in ipairs(tiles) do
+        mTiles[v.x]=mTiles[v.x] or {}
+        mTiles[v.x][v.y]=v
+    end
+    local ret={}
+    for ty=0,h-1 do
+    for tx=0,w-1 do
+        if mTiles[tx] and mTiles[tx][ty] then
+            table.insert(ret,mTiles[tx][ty]) -- leaves x and y in but who cares
+        else
+            table.insert(ret,{})
+        end
+    end
+    end
+    return ret
+end
+local function processFrames(shop_def,frames)
+	local w,h=shop_def.dim_x,shop_def.dim_y
+    for frame_id,frame in ipairs(frames) do
+        if frame[1].x~=nil then
+            frames[frame_id]=generateFrame(frame,w,h)
+        end
+    end
+    return frames
+end
+function registerBuilding(args)
+	local shop_def=findCustomWorkshop(args.name)
+	local shop_id=shop_def.id
+	local fix_impassible
+	if args.fix_impassible then
+		fix_impassible=1
+	else
+		fix_impassible=0
+	end
+	local consume=args.consume or 0
+	local produce=args.produce or 0
+	local gears=args.gears or {}
+	local action=args.action --could be nil
+	local updateSkip=0
+	if action~=nil then
+		updateSkip=action[1]
+		registerUpdateAction(shop_id,action[2])
+	end
+	local animate=args.animate
+	local frameLength=1
+	local frames
+	if animate~=nil then
+		frameLength=animate.frameLength
+		if animate.isMechanical then
+			frameLength=-1
+		end
+		frames=processFrames(shop_def,animate.frames)
+	end
+	
+	addBuilding(shop_id,fix_impassible,consume,produce,gears,updateSkip,frames,frameLength)
+end
 
 return _ENV
\ No newline at end of file