This. Is. Insane.
I've just read it through from start to finish, it sounds like it's been a hell of a slog but you're not far away now. And I know it'll be worth it once you've got it all done and dusted.
Normally I'm more of a fan of keeping minis standard but the sheer amount of love and engineering that's gone into it is going to make a blindingly fun, and fast, machine!