I do custom work - over the years I've built all types of pickups for customers - for early Gibson's, Guilds, Mosrites, even for Chinese Erhu's! This is a very labor intensive project, including sourcing materials, custom fabrication, finding information on original specs. It can be done for those with the resources - and the results are well worth it.
That said, even if you are looking for something fairly traditional - like a mid 80's style Strat pickup, or even if you wish to alter any design I have, or have the exact specs for a particular month of Fender production, I'd be happy to oblige.
I've built, rewound and repaired vintage Guild, Gretsch, Mosrite, and Rickenbacker pickups, so I am happy to work on these types of pickups, as I have a huge respect for those guitars and their tones.
Price: based on $65 per hour labor charge.