Yeah, looks pretty good. The ambient occlusion could be a tad smaller scale. Is your scene to the right scale for UE4? I've made a few game maps and I think the players are about 196 cm tall. That would give you a size to add a humanoid model in your scene to see if it would fit through doors. I'm not sure if there is a way to manually scale down the AO like in C4D.
Yeah, the UVW part of making model in C4D to port over to UE4 via FBX is the main issue I have too. Sometimes I get it to work, and sometimes it looks horrendous.