Inside houses with roof and walls

I have an idea but I think is complicated. If theoretically you can make a house model with a inner texture, (the model is just the "shell" of the house), you can use custom destructalbes to simulate the wall's pathing. that means that if you can make a proper third person or first person camera, your unit will me able to enter houses and buildings with a genuine effect and no triggers to do so. SO
my question is: does anyone knows someone or somemap who did or tried this?

I remember seeing xXm0rpH3usXx models of such things. You even have a test map that shows how to make roofs transparent once you enter the house and turn them visible again when you leave the house.

http://www.wc3c.net/showthread.php?t=88047

World of Immo has it, where the building is an oversized doodad with pathing blockers on the walls.

plz link?