Time for an update on this project. It is still ongoing although there have been some bobbles...both procedural and personal. At any rate, after a year of work I have settled in on a fiberglass prototype and am casting a mold for it today. I'm also working with a friend on a CNC program to modify some other experimental fiberglass pieces so they can be used. Rather than just have the radio piece sit atop the blank-out plate I've elected to recess it so that the radio piece sits more or less flush with the piece (there are limitations, but if this works, I think it will be more professional-looking this way). You can see what I've done in the images below...in steps. Also, this radio doesn't have an on/off switch (the gentlemen in China designed it to be turned on/off by the remote control device which came with it), so I'm adding one into the round headed bolt which holds the radio intact. I'm still making a prototype and a fiberglass mold for that. Microsurgery is more like what the switch is, but you can see what I'm working with and what I've decided to do to incorporate it into the hollow threaded rod that will become the bolt. I see where there is still interest in a 6 volt radio. Please keep in mind this one will pick up FM stations, play MP3 files on either a tiny TF chip or a USB thumb drive, will accept and play bluetooth music, podcasts, etc and will mate with a cell phone allowing you to answer incoming telephone calls hands-free. There may (according to the schematic/engineering data I received) also be a voice recorder so you could use the TF (Micro SD) chip or the USB stick to record spoken things or maybe you might record yourself singing. At any rate, it will work on 6v, 8v, 12v or anything up to 37v. I figured that was enough room for variance...5v at the lowest to 37v at the max. The antenna connection will be at the lower rear of the back side as you see below. At this point I'm still encouraged and more will follow in time.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end