So I got board again, was looking at 2" and 3" fpv quad and decided to whip something up. You can choose from a 190mm and 140mm bottom plate. The top plate has 2 styles, 1 with a hole for sma mount and another with zip tie points. The cam mounts are sized for the runcam split mini 2. They will be best made from tpu. The mounts slide over the standoffs. You will need 4x 25mm m3 standoffs, cam mounts, and your choice of base and top. this was designed for 20mm x 20mm stack, with 3 stack mount sections. For the 140mm base will fit 1.9" to 2.5" props and the 190mm you could fit 4" but was designed for 3". I think 1107 to 1407 motors will be good fit. I had the thought, what if some one wants high mounted motors. So I made the flip style, this puts the arms at the top of the frame. This gives more options.

!!!! THIS IS UNTESTED AND CHANCES ARE REVISION WILL COME !!!!