While the ideas were fresh in my mind, I took a look at this again tonight using printbus suggestions as I understood them. I used a thickness of 6mm for each of the plates. That seems to match the thickness of the wood pieces. Here is what I came up with so far. I attached an image & a stl file for you to take a look at. I think the hole patterns should be pretty close, but the square hole might be a little over size. I do not plan to use the square hole, but a part from thingiverse that I remixed.X-MotorMountOnePiece_rev9.JPGi3v_X-MotorMount_rev9_repaired.stl