First I would have started with modeling a simple blockout of your model and getting it in the engine. Then I would break up your house into modular parts and panels. and model the modular parts of your building that you will use in the end. Look heavily into modular workflows and how to do it. I believe tor frick has a…
I think your blockout is really strong and should help you a lot moving forward. Next thing you would want to do is break the house down into the modular parts that you can repeat and reuse. Not only on the model side, but on the texture/material side as well. The wiki has some good info about modular worflow:…