Bob- well, as you know mine does have a narrower nut and the neck pup close to the neck - both features that I like a lot and aren't that common, although I would hardly call them custom appointments. It's also in great cosmetic shape (due to the previous owner having it spruced up with some new brass, pickups, etc from Alembic). I don't think it has had the electronics upgrade, but is dead quiet nonetheless - and I play it in exactly the same Toronto location as my long-gone 1977 Medium scale, which really needed the electronics upgrade (& received it before being sold to an esteemed board member :-).
I guess it's perfect for me, but those elements I don't think make it any more valuable on the open market.
Frank