Quality custom is impossible to find. *Generally luthiers will not bother doing any sort of custom work just because they feel the money is not there for it when they are busy charging people $100+ for setups.
The market is flooded with people who will lower your action and do a mediocre job intonnating your axe.
Now finding someone to put a 24
fret neck on an S Series... that is a completely different story.
If you can branch out to doing custom replacement parts for many brands of guitars... you may find great success.