How many ppl in real life do you know that have a furniture building machine in their house taking up less than 3x3 floor tiles? ;)
Building furniture could be a cool feature, but I think it would need to take place on a community lot, like a factory (big or small). And I would appreciate if we could be a bit creative mixing and patching, not only the paint color, but like combining different styles and shapes in one object. Creating a chair or table that ain't available in the game (showhiddenobjects) would be grand.