The wheels, axles and disk brakes are fine. I think these items are offered as spare parts for your trikes. As I intend to build my own designed vehicle I don't have a template to see how the parts have to be assembled. I missed a paper describing the assemblage. I'm happy with the products I got. But when I ordered, I had very little information on the product. There is no drawing available in the shop. You could add a CAD drawing (as .pdf) showing the dimensions and parts list.