So, ... the informal responce to my Hoth/ Preproduction Stlye Fett was:
"It's the LMO's call of course, but because it was a work in progress, and not the final approved design used in the film, I would say that it wouldn't qualify for membership. Otherwise we'd have to accept every pre-production costume sketch of Vader, Stormtroopers and other characters to be consistent."
I have yet to formally submit it to the 501st, but there does seem to be another "white " Fett already official in the 501st bounty hunter members, ...don't know if he was grand fathered in? It really doesn't matter to me one way or the other as I already have a few "Canon" 501st costumes, and the sun doesn't rise and set in the 501st. I got the Hoth Fett costume from Man of War because, quite frankly, it kicks arse!!! And Man of War, (Christian) did a fantastic job, the quality it the highest I've seen, and I wanted to do a white pre-production Fett and knew I couldn't come close to competing with the work Christian did!! So, my white helmet off to Christian, you couldn't find a nicer guy to do business with, top notch Fett armor, IMHO.