How do you add interiors in-game on the mission editor?

[Music For Life]

I was building a house(out of bricks) on map with rain in it. I completed the house and went inside and noticed how all the rain went through the bricks. I tried looking through the mission editor for interiors but all I got was buildings like the bedroom. I was wondering if there was a way to fit an interior area into the house(made of bricks) AFTER you have built it.

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[Deathwishez]

It's possible. You'd need to use torque constructor, and just leave openings where the windows and what-not are.

Also, I don't think that you can stop precipiation.