This is the same layout as seen in the P3D version. The ground layout was drawn in 3dsm (line tool), not with Blender.
I suspect you used multiple layers of polys for the different type of textures?.
First time trying to do it this way...not sure how aircrafts will not pass thought the textures when taxing.
Are you using PBR for all the textures?? If so how are you handling hand painting the windows/doors and getting them as PBR?
Substance Painter for PBR? or just a simple Texture Sheet made in Photoshop from your buildings UV layout?.
(Sorry for all the questions)