I have a bad feeling that these wheels may give you more hassle than you have bargained for.
I am not saying this to downplay your efforts by any means, please don't take this the wrong way.
That aluminum looks very thin, too thin for effective use on a mecanum wheel. Second, I am fairly positive that rollers should be tapered from the center of the roller (also I would not recommend delrin as the roller material).
Note that AndyMark mecanum wheels use "
convex rubber rollers are sandwiched between 2
steel welded plates" and that is after getting complaints prior to 09 that the wheels were weak and dented easily.
Again, I am just trying to look out for your team. I would really look into purchasing
mecanum wheels from AM or seriously rethinking this wheel design.
+.02