Nice Work! :)
Get her anodized and your off to the races!
FYI:
To keep the center of mass in the same place, the base plate must tilt at a common point (free-air, some inches above the base plate) that is relative to the cameras CG...perhaps think of a swing where the pivot point is the bar in the air (camera's CG) and the seat is the base plate, which only moves +-20 deg and can be fixed in any of those positions...
Any which way, trimming the X is probably just as good!
Take Care and enjoy your new POV!
Charles