While I hate the idea of disfiguring a Joust cocktail, it's not like you would be making it worse going MW.
There was a time when I liked (probably too strong a word) working with Williams board sets and there is plenty of good documentation out there, but wiring them from scratch will be a
complete ---smurfing--- pain wonderful exercise in restoration (does dokert over on KLOV still make Williams harnesses?).
Depending on which way you go, if you can't find files, let me know and I'll drop my CPs onto the scanner and you can vector away.