Ok, thanks for the replies guys. The rail I ordered was for AR15 hand grips (There was a difference?) so I had to sand down the extra bumps and fit it on, but it worked out great, the stock saddle is especially nice now that is clicked on and the multi position grip feels great.
I'll look into custom fitting batteries as well, I know of a supplier who gets me these parts for ar15 users in canada and whatnot so it's not difficult.
The grip might look a bit wonky: it looks better in person, but regardless I have this innovative cover for it called my hand, so appearance is pretty pointless.
thanks for the help. Now onto my hop up screw.... and field stripping this damn thing.