Mostly directed at Valisarius, as you did the modelling and probably have the best idea of what's going on... I just noticed one or two problems with the interior here. Actually the only one I can think of right now is the stairway on the left side of the house going up to the second level. The wall adjacent to the stairway that connects to the other side of the house, you can walk through that wall... causing you to fall through and get stuck between walls. I would take a look at it if I knew what to look for... but I really have no idea.

No problem. I'll take a look at it. There will be a gap in the collison box that will take seconds to fix.