I've wired a few similar things (and a lot of very dissimilar things)
The '56 Inter I re-wired only had about a dozen wires and they all ran back to a thermal trip out that is part of the headlight switch.
If you're looking for something other than MDF to work with try a nylon chopping board. You know, the kitchen kind! You can buy pretty big ones cheap and they machine well so you can tap, drill, saw, recess etc neatly with the same tools you're using for the MDF. You can even make a laminated switchboard so that there's no chance of shorts from behind. They'll take a bit of heat too.
If you're really nuts and have a lot of time on your hands you can use a router to conceal wiring in behind the board.
You can also buy the nylon chopping board material from an industrial plastic suppliers along with lots of other cool stuff. K-Mart is pretty cheap to just get a big chopping board from though.
For a Rat Rod I'd probably use old fabric covered mains leads for the exposed wiring. The sort of thing you find on old toasters, kettles, irons etc. The mid section of the lead is usually OK you just have to know how to bind off the ends of the fabric sheath properly and how to terminate according to the conductor type. (Anyone here ever worked with tinsel wire?)
I have another technique in mind for a special project one day, brass wire bus bars! Has to be an early car with only a small amount of wiring and firmly mounted terminations but I reckon I could pull it off.
Just wish I had more time.
Pete
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