Well, here is my reasoning. I could quite easily 3d design and print a extension door, if you take your vs and pop off the door then hold it about a inch away, u will see it would actually still be quite a nice size and really be a minor change, looking at the attachments replication would be easily. This could even be an official change vs pushes if they sold a larger door and bat pack. I agree that the mod is solidly built and I am not really interested in ripping it apart, just a minor mod to extend battery 300-500mah, which would result in up to 50% more life. Another potential issue is the connector would prob need to match for discharge wires as the Fullymax has no connector. Here is the only batteries I found that could possibly work, and there not much bigger and idk if they could even work since there constant and burst levels are either really high or just below Turnigy nano-tech A-SPEC G2 1000mah 3S 60~90C Lipo Pack http://www.hobbyking.com/hobbyking/store/uh_viewItem_B.asp?idProduct=80281 Rhino 1050mAh 3S 11.1v 40C Lipoly Pack http://www.hobbyking.com/hobbyking/store/uh_viewItem_B.asp?idProduct=9608