Modular houses?

I was hoping someone on here can help me with a modeling question. I model in maya and I’d like to do some modular houses that include interiors, roofs and everything else. The problem is I can’t find any info on how to do this. I know grid settings and fbx exporting and such but can someone point me to a tutorial that covers all the aspects of what I’m looking for. For instance, are trim sheets used, how to section the pieces and making pbr’s that work in unreal. Basically all the aspects of modeling a house interior and exterior in another program and then putting it all together in unreal.

There’s plenty of tutorials on this:
#1 for example.
My suggestion would be to split any building somewhere where it’s not visible, like behind a pillar or something, to hide seams and to hide lightmap baking issues that may arise