Importing complex BIM model into AR project

Hi all, just started using UE5 within the last couple of months.

I work for a construction company and I’m trying to demo importing and displaying BIM model using Android AR. I’ve imported the model (~300mb) and I’m up to testing it on a mobile device. I need to do a lighting build, but the build is stuck at zero. I suspect it’s got something to do with the model being really inefficiently put together. It has tens of thousands of static meshes and stuff like a trash can might be made up up 20 different meshes put together instead of one “bin static mesh”.

I think I’ve exhausted all the tweaking I can do from a macro level. Are there any best practices that might be being lost in translation between an architects CAD system and UE5?