A customer asked me for PCBs so he could build the XTBM-Pro for himself, and I ordered a small batch for him. He decided to use the extra PCBs to assemble complete units. I worked with him to provide the components to do so, including the jig to drill the holes in the cover. I don't know the current status of that project, but if you contact me privately I can provide his email address so you can contact him directly.
FYI, I am in a similar situation with XTB-IIR PCBs, and have the components to assemble a few more custom units.
Jeff