Hi I see used "as is" pro or advanced on eBay for a decent amount. Normally camera and gimbals are missing. If I were to get a used damaged one, swap out the shell as needed, is there any chance of using the onboard lightbridge with another gimbal and a GoPro perhaps or must I use a 4K camera for a pro and a standard 2.7 camera in a adv? Can the cameras be swapped between models? (Std / adv / pro)?