my guess is they bolted all the metal to the frame without wood and the bedbolts that normal hold it to the frame are under the wood. (that is how mine is) and then they put in the bedwood with strips.
mine side strips are welded (i have a 1956)
Take out your bed wood strips and I'll bet you will find the bolts thru the crossmembers and you can undo and lift it off.
