CRKBD very low profile case

Based on https://cad.onshape.com/documents/bfb900a9c630f18c88918581/w/08a61a5a0552a06d8b7be5a7/e/3f99423905aab426377edef0

The goal was to have a case that fit snugly around a corn PCB and just follow the edge of it te be used for a very low profile look with a choc build. For that I removed the tenting hears and changed some of the dimensions.