A few screenshots of my progress converting the casablanca (mini map) to a UE4 level. Here's what I've done so far.
Started with Radiant, deleted all the models, clips and sky portions, saved this as a new map.
Converted this map to an ase file. Using notepad I edited out the material names textures/casablanca/texturename and changed this to just texturename. I then imported this into blender.
In blender I removed all faces with caulk and cleaned up and uvmapped everything. Resized to 2.5 (cheers Quick) and exported out as an FBX file (only the mesh and with smoothing set to face)
Imported into UE4, looks kind of OK, gives a zillion errors when building though, lots related to overlapping UVs....
Stuck at this point.