It’s great to see people practicing CAD! A couple questions and suggestions though. First, why so many wheels, and why custom wheels? Also, I’ll echo what Anthony said about mounting bumpers. From what I can see, I don’t think your frame would be able to adhere to 2017 bumper rules. I’ll also echo what Zach said about beefing up the outermost plates. They look a little flimsy.
This may just be my eyes playing tricks on me, but is the plate the CIMs attach to just a flange off the bellypan? Or are those two separate plates? If it is one piece, I’m not sure how I feel about that. On one hand, it’s probably light and sturdy, but if that bend is even slightly off of 90°, it’ll wreak havoc on the gear mesh. Spur gears don’t do well under even small amounts of angular misalignment. So if you have some way of precisely controlling the angle of that bend, go for it. But if you just have a manual brake, I’d steer clear.
In general, I’d say to always justify the complexity in your design. Complex and beautiful pocketing patterns may look great in CAD, but you’ve still gotta cut all that material in real life. Consider manufacturing when creating designs, and your fabricators will think much more highly of you.