Here is a cradle designed for an SXU that uses a hinge-lock system to secure the handset in place. I am still pretty new to 3D modeling, so I am happy to get some feedback. It was originally made for a friend who needed it to just sit flat on a cart and not wobble, but I plan to have an option for 3/8 and 1/4 threads on the bottom and side for mounting. Once that is done, I will upload it to thingiverse. I can also show more photos if people are interested. The hinge uses m4 inserts and a metal pin for longevity.