These last two weeks I worked on adding roofs to my building tiles (so they are not just flat). This was a huge pain in the butt, as I had to replace a lot of parts, and the way the tiles connected was mind-meltingly confusing. I got it (mostly) to function which is quite exciting, and all of i is currently in use in Unreal Engine.
I also got the collision workflow for FBX files working for the first time. I added collision to my warehouse model in Blender (using cubes) and tested the UBX file naming which worked (eventually) on import.