Hi, I actually just completed my Makita battery packs. its awesome. I used nick a tron props for the cup holders
http://www.nickatronprops.com/products- ... plate-set/ But youll also need the bracket to hold the batterys and cups in place. I used a private prop maker do make mine. PM me and ill send you his email and see if he can make a commission. Keep in mind, the cups that nick sends are too large, so youll have to trim them down a bit.
EDIT, I also have 1 spare Makita battery