The models are stunning, so would not let finer technical detail get too much in the way of ownership.
Yes, the canopy is irregular, there are not enough frames in the tent and pull down canopy should be off the end of the main tent. The wheels should be the same size. Don't worry too much about spokes, as the wagon repairers probably did not take too much care of that sort of detail anyway. In any event, different manufacturers may have had variations in the design.