I like the panel for a number of reasons, but I think the main one is that you just don't see a ton of them around. First gen Broncos, no mater how awesome, are pretty plentiful. Heck, I can see one out my office window right now. (no, it's not mine)
I did some surfing on the inner-webs and was able to glean some information about the 57 Cummins Panel.
It appears to have been built by an outfit called Five R Trucks and it appears to have been at SEMA this year.
Unfortunately the website for Five R Trucks seems to be having issues, so I didn't really gather much from them.