I have spent the last week building a home and have about 15 hrs doing it. Below are some of my suggestions for what it is worth. I have over 7 years in different worlds creating stuff and also have created some sailboats. So this is not like I just got off the turnip truck yesterday.
1. Every object should have a face that is editable. This allow more than one face to be textured. Try building a roof that looks like a roof. Those textures should be adjustable just like the object is. That way changing the size of the object is not a big thing.
2. Should have a way to align objects with just a couple of clicks.
3. Where is the textures for roofs ? As far as I'm concerned there are none.
Now I find it interesting that stuff that's been created by 3dxchat employees look better than what the tools they gave us will do. I expect they are being created outside 3dxchat and being imported in. If so why don't you give us the ability to do that too. I have been doing mesh for several years now and its soooooooo much easier to create it using it and then import it in with the textures on it.