Just want to follow up real quick.
I've rolled out a copy of a20 to try out your mod, it looks like it fits for the most part, small alignment issues but nothing to crow about.
As I've said before this is only a rough draft. while we fit scaling, and implementation stuff.
I'm Currently getting a crash course in materials and texturing going from GLSL>PBR standards, so once I have a fundamental grasp of these things I will resubmit the mesh with all the proper baked textures. It's just going to take some time until I get this under my belt.