1) yes you are right there are no toe brakes but no problem to finish it. 2) yes, 6 pcs are standard skateboard/in-line skates bearings and 4 pcs on main shafts are a little bigger bearings. 3) most parts are made from 6mm alloy and bearing housing for bigger bearings are made from 8mm alloy, no chance to bend it. Why alloy? It is lighter than steel but quite firm, no corrosion, I think it`s better than steel for this purpose. 4) so 6 and 8 mm thick. 5) no noise with movement.
If you need some other info give me know, no problem.
