I am currently pushing a bugfix patch which will deal with that bug (and Rush not restoring MP) so good timing.
At present the art assets are proprietary but if you'd like I could put together a special set of tools for you (promise not to share them!). The game is reasonably modular in how it handles the TFs but you'd need to be pretty good at Lua.
Good to hear, and yeah, you can definitely trust me not to share those, it would be super appreciated. I've been making commissions for years and can understand the security need of it all, plus it's just respecting your wishes anyway. I also may not know much Lua at all, but i can try to learn, worst case scenario it would be fun to try.