Sorry for no updates. Not going to lie, I burned myself out on this. I recently subscribed to the AirCorps Library, and have access to schematics of the various pieces and assemblies of the Mustang. This is a lot more reliable than simply eyeballing pictures like I've been doing, and am slowly chipping away at a 3.0 (I've redone my previous work so many times at this point).
For now though, I'm working on a different project for a different game, as part of a squadron I'm part of. When I'm finished with that, I'll hop back into this.