I have basic knowledge over UE4. I have set up collision, input, and a character, I can move around in my apartment. But the Lego anecdote does indeed make sense, and I guess you’re right. I’ll just make everything a bit easier for me and export floor, walls, and ceiling separately.
P.S.: I feel honored that my question was answered by you, Luos, the creator of “Luos’s Four Elements” which I use very often! =3