I just replaced the bed in my 57. (I know, I have to post the pix)
Anyway, I placed the boards in the bed with some bolts and steel strips and aligned everything (time consuming) then marked the bed to frame location from underneath with a sharpie (only two boards) - pulled and drilled the locations - replaced them, bolted everything up - done.
Willis40, I'm guessing your boards are all pre routed? If so, this should work fine for you. Just double-check the measurements for the bed to frame locations on every hole (should be eight - was for me). Then drill them out and use these as your guide for the remaining boards.
Good luck,
HC
