Thanks for the responses guys, I am taking my sweet time with this project because I want to do something clean for conversion to power. I've been driving the burb as is for as long as I can remember, so it's not like it's been keeping me from driving
I may just draw up a paper template of my frame and the PS box mounting holes, take it to a fabricator and just have them make me one since I don't have the resources to make one myself.