There shouldn’t be anything different about how func_details are handled.
There might be some problems when calculating normals if there are invisible angular polygons, although the smoothing code should be able to handle those…
Yeah, that’s the one.
“Ignore” doesn’t touch the models
“In PropUEr” bakes whatever the current scale is at the moment you do your first actual model import, so they’ll always have that scale by editing the vertices
“UE scale” sets the model’s scale value to the current scale value at the moment of importing into a map, without changing any of the model data itself
(So if you’ve imported with In PropUEr, be sure not to switch to UE scale or it’ll be scaled twice)
Technically, you can if you don’t untick the nodraw column for clip textures (you can type clip in the textbox that appears when you’ve opened a map, and it’ll highlight all of them to make it easier to find them.) It’ll then create solid meshes with the transparent clip textures, which you’ll… have to replace with an unreal blocking volume, I think? Or you could just turn off Rendering/visible for those meshes, maybe that’ll work too?
Sorry, I haven’t done any actual level stuff in UE, so you’re probably best off looking for someone more experienced there.