Scat Pack 4 piston Brembo calipers and rotors
I design everything using a MasterCAM Draft license that I bought 20 years ago for $99. I've never upgraded to 3D. Most of my parts are 2.5D since I rarely do anything that is truly 3D. The radial mount parts are so much stiffer that you can make them out of aluminum. Aluminum is much faster to machine so the cost is much lower.
Here is a picture of the Viper kit that I used to sell. The rotors were off a Mercedes S class, the calipers were from a Viper and the brackets were made from aluminum. They were basically just some aluminum bar stock with some holes drilled and tapped in them. This was all designed in MasterCAM 2D and made by local machine shops. The brackets didn't cost me much to have made, maybe $40 each.