Handheld gimbal for mid size camera

This is a hand held gimbal for a mid-size camera. The PDF shows more info and BOM.
The project is a work in progress; I expect to give an update march 2015

Based on: http://www.thingiverse.com/thing:379926

UPDATE 2015-2-26: all parts are printed and put together. Looks good! Electronics and testing next week?
UPDATE 2015-03-11: waiting for new control board to arrive from China. Smoked the first one, stupid mistake. The good news: the joystick worked as it should do.
UPDATE 2015-06-21: small corrections in the three GRIP/greep STL models. And, yes, 3 months after birth of this thingi, it turns out to be a useful tool. Allthough, I have to admit, I use it in combination with a small Xiaomi (GoPro like) camera
UPDATE 2015-08-29: added file arm2-motor-90degrees.stl (see Celbine's request in comments) + updated screenshot SimpleBGC settings.