[Joe G.]

Looking at the 3d model closely, it looks like the lower mount hole on your CIMs is partially blocked by the large dog gear. Easy enough to solve by rotating the CIMs a bit so that these holes move outwards.

Additionally, it's hard to tell, but you may not have left enough room on either side of the sprocket for the actual chain to comfortably exist without rubbing on things. I'd double check this before producing it, it looks awfully tight to me, especially for #35 chain.

Not so much a design flaw as something to be aware of, but it looks like some of your standoff holes are going to be inline with your frame if this is mounted to a conventional 2x1 box chassis. Make sure to add clearance holes for these, or even better, use them to provide extra mounting support.