Biggest SH3D construction ever for me is < 2,5 MB (compressed). And that is a very detailed project. But I do pay a lot of attention to model / texture sizes. I suspect you could find some elements that account for most of the bloating. ok

I'm not so sure it's bloat. If you read this post I just made, if it were bloat then why would a photo taken in a 135 MB file take considerably less time than one taken from a 70 MB file?

I've also become more aware of model sizes too. In my first project I didn't pay any attention to model size. That's why it came out to 135 MB, and it's a much smaller project than the 70 MB house (this one)