• Jack nut pressed in really tight. Loosen this a bit if at all possible. It made the threads jam up. I re-tapped the threads after pressing it in. It didn’t press in all the way (about 1/16” didn’t go in) but the flange also wasn’t quite to spec so this is a good representation.
• Everything went on the axle tighter than desired. Maybe this should be undersized.
• The main axle is too long for the pins to latch over. I think it was fabricated wrong… double check this. We just elongated the clips on the pins for now.
• I sanded out the bores for the main axle bushings. This didn’t take long. This is probably the right thing to do - don’t even change the nominal hole size, just sand to a nice tight slip fit.
• The main tube would go on easier if it just bottomed out against the bushing. Just do it. Or slot the sheetmetal. Do something so this is easy.
• Maybe you should make the towbar telescope!
• The drive motor purchased had M8 threads.  It also didn’t need the spacers (spacing was perfect already!). It just needed the shaft cut down. Verify what you’re working with.
• Need to chase / retap the M12x1 nuts after welding (and prior to painting).
• You didn’t order or make the steering handle. Robbed part from THF. It’s not the right thickness though.
• Enlarge the sheetmetal holes for the steering bronze bushings. Radial positioning of these bushings is irrelevant. No need to have press-fits on an obnoxious weldment.
• The lift motor is sloppy. If you tighten it it's much better but still kinda sloppy. Remember this is tapped into a .09" thick wall tube... So tightening scares me a bit