I now have an RCTimer OpenSource BGC board ("Martinez") and a couple of LD-Power Gimbal Motors which are large enough for an NEX or smaller. I looked over a number of BGC frames for sale but they all seem to incorporate metal or glass fibre, both of which do not have the same strength and low weight of carbon fibre. Based on the connection system I had used on the first CF gimbal I built from scratch (servo based), I have come up with this design with the size needed for a Sony NEX and the adjust-ability to balance for any camera of that size or smaller to maintain roll balance. Also, the base plate the camera sits on is deep enough to move the camera back to balance the weight on the pitch axis due to the size of the NEX lenses.
Once I have hand crafted this design I'll post some video. From there, if there is enough interest I may get a batch of these laser cut and put them up for sale. Roughly $30 of 2mm CF board for this and whatever the rate is for laser cutting.
This specific design is for the LD-Power GM4008-57 motors which are 45mm in diameter, 21mm in depth and 85g each. Still need to work out how many poles these motors have to be able to set up the firmware correctly. If anyone knows please let me know? I was planning on using the smaller LD-Power 2208 gimbal motor which was 39g or so but the eBay seller had the wrong picture and weight in the listing.