[AustinSchuh]

I'd say that the flanges that you have on the frame are not nearly large enough. The should be at least 1" long, and probably closer to 1.5".

I'd also recommend switching the pairings of power and steering so that the two wheels on the short side are ganged together. This lets you car steer when driving with the long side forwards (when it is hard to skid steer), and skid steer when you are driving with the wide side forwards.

Also, think through what you are going to do for sensors very carefully, and draw them in. You don't drive a swerve without lots of sensors and control loops.