[nathannfm]

It's hard to tell from this angle, and I assume you checked this already, but it looks like the belts to the outer wheels might interfere with the CIMs.
Also, I can't really tell what's going on with the outer wheel axles, the hex looks like it just kinda merges with the 2x1 with no bearing, and on the oppisite side looks like it has been turned down to 1/4in or something.

...wait...

Those are bolts aren't they lol, I have never seen someone cantilever bolts before, you might get some wobble if the threads are going through a bearing because the diameter won't be exactily that of the bearing or the tube they are running through...

You might also consider adding a 3rd CIM in the center with a shorter belt and widening the pulley to accommodate.

Those plates give me a bit of pause, you may want to brace them, but its worth a try in the off season.