only some SD cards, there are SD cards that record in full 1080p, expensive as shit though, and ive gotta 1080p camera and it only records 480 cause of my SDs, HDD is the best way to go
wwaayyyyy expensive, but sick, and you said that making a CNCed deck was cheaper and more cost effective, but you almost doubled the price, most expensive deck on the market if im not mistaken
EDIT: the headtube looks like a prime headtube