[roystur44]

If you design the cutouts on the top of the frame bigger you can drop the wheels in/out without taking apart the side panel.

Add more material around the axle points.

A staggered .75-1.25 dia" circle is a better/stronger lightening pattern.

consider a rail mounting system for your manipulator

adding one more return flange on the front and rear side panels would make the panels considerably stronger.

hexed live axles is the way to go


Roy