FBX works but like you said to import something like a House you will be in hell trying to deal with a ton of little parts. Also, messed up textures and many other things. The better way would just add native SKP import to Unreal Lumion has had that for years and it works VERY well.But that is a PC only program. Twinmotion is pretty good and there IS a Mac version. That takes SKP files directly but I love Unreal and Sketchup and can’t wait for the day that they work directly together on a Mac.