Could someone teach me how this was made?

[Pinzu]

http://www.hiveworkshop.com/forums/maps-564/castle-defence-241169/

You create an elevator under the building and open the walls towards the side you want path-able or what?

 

[Dr Super Good]

You can open the JASS script in a text editor and see if you really want. Otherwise contact the author and ask.

 

[Pinzu]

You can open the JASS script in a text editor and see if you really want. Otherwise contact the author and ask.

I have looked, and he made custom pathing and invisible models which are elevated from the ground and when the structure is built it's placed right under it. (I think) It's not very easy to follow for me but I gave it a shot. ^^