Bob: The history on mine has some blanks. It was delivered to the AAF in Dec 44, if I remember right. It bounced back and forth between Ellington Field and Tinker Field until it was surplused in May of 45. Sometime between then and the late 60's it ended up being parked on the edge of a wheat field in Saginaw, Tx. Sometime prior to the museum getting it in the early 70's, it was heavily vandalized and the engines were torched off of it and along with the cowlings and instruments, disappeared. From then, until I acquired it in the late 80's, it resided in the storage area of the museum. After the passing of a couple of the volunteers that worked to get it, interest in restoring waned to almost nothing. Even if they had decided to carry on, the museum had no protected work location or even a building or cover to place it, or any of the other aircraft on display.
I've got copies of the original factory preliminary SRM that was not published and a copy of the Pilot's handbook. The factory book is in rough shape and while complete for it's printing, it's not what the field would have for working on the aircraft. I do have what should be a full set of drawings, although some are almost unreadable due to low quality work when they were microfilmed. I'm always looking for more documentation and parts for the project. I have a contact that goes to the NASM archives fairly often and I've got some queries on some material there that I want him to check out on one of his trips there. Unfortunately, I haven't had contact with him in a while and he hasn't answered the last couple of emails I've sent him. I may have to wait til I retire and make a multi-week trip there to do it myself.
Over the last several years, I've gotten hard and heavy on acquiring parts for the restoration and am down to some really small and hard to find stuff. There are things I will most likely never find, so substitutes will have to be found, such as cowl flap drive motors, some QD's for the engine bays, landing gear motor and the weird Heim joints used on the push rods for the controls.