Sad, but, in my experience, true -- with so many changed parts and odd features (pickguard, replaced necks, pickups, no finish, etc.), it simply has too many stories to make it easily marketable.
A collector generally will prefer a straight, no-story, or minimal alteration piece to a guitar with a deep, hard to verify narrative -- hence your displeasure over the uncooperative "expert" analysts.
You might find a store to move it for you --they will hawk it as a unique prototype and try to make the issues a plus (spin happens in the vintage world just like in politics). But I have seen several prototype guitars and amps (some discussed on these forums) which start out demanding big sums for their historical value only to sell at far lower prices when the "right" buyer is located.
Bottom line -- it is movable, you might hit it big, but it is a harder sell than, say a fifties, few-issues, strat.