[daltore]

How is the wheel module held on? Without seeing the bearing/plate mount, I can't tell if this advice will be useful or not, but here it goes. Have you thought about having supports on the front and back between the two side plates? They aren't strictly necessary, depending on how you've set everything up, and with that thickness aluminum, it should be fine either way, but on the other hand, it's a nasty bump...

Otherwise, nice compact design, I like the setup!