The mount is slowly evolving. That's the good thing about being able to make parts yourself. If the overall idea shifts, you can just make new parts. I brought the side bolts closer together (24mm to 16mm) due to possible clearance issues. The inner hole was increased from 13mm to 18mm to accommodate even larger thrust bearings for 6mm shafts. I replaced the cooling vents with another set of mounting holes. This will allow the motor to be clocked at 45 degree intervals instead of just 90. I also do not like the idea of only using two bolts, so I kept all four. I also made the angle adjustable from 10 to 30 degrees. That should be plenty.
I would like to play around with the idea of water cooling the entire circle instead of just the top edge like all of the other cheesy mounts. The unfortunate part is that it would compromise the overall strength of the mount. The only reason I went with 1/4" was to allow for the use of m4 side bolts.
The motors you see are the FC3730 (larger outrunner), 4082 with a 60mm long jacket, and the smaller HF500 (closer to the Scorpion's size). For reference, the mount with the twin outrunners have 3/16" side plates, while the inrunner/outrunner mount has 1/8" side plates.
As I was making this post, I came up with the last design. No water cooling, but a lot of through holes. It shouldn't compromise strength at all. I can also bevel the edges on one side. (I don't really want to try a two sided bevel again with this machine.)
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