Axle Supports!
I started by cutting paper Templates for the Axle Supports. Then I transferred the shape to sheet plastic and made 2 Axle Supports. I Test Fit the Tires and measured the height for an Axle. Next I drilled the Axle Holes.
I measured the positions for the Axle Supports and then glued them in with Zap-A-Gap.
Next I cut a length of plastic tubing, for the Axle, and glued it in place.
More Coming...