wow, thats really well done. IM gonna do the same thing to my flex7, but im not gonna go running my fans at 24v. im assuming those fans are for computers, which would make em 12v, which would make em overly loud at 24v and would make em have a shorter life and less efficient with the batteries. Im either gonna use a single sunon 40x15mm fan or a T&T 40x10mm that I have laying around for computer stuff.
I will let y'all know how mine turns out