Looks like a pretty good setup. If you get more than 15 minutes racing off 3700mah thats impressive.
Those battery trays sound like what I need for my truggy.
***RC***, so you can fit 8000mah TrueRc packs in these trays? Those batteries are 145 x 50mm I think, so are they really tight if the tray is only 49mm wide? Or do you stand the pack on it's side?