Southtowns27,
I would do a real good search on this site before I did anything. I was going to do floor, toeboards, inner and outer cowl etc on my 55/1st, and after reading about poor fitting reproduction parts, cabs that tweaked and just general pain in the rear end stuff, I found a rust free cab, thank the stovebolt Gods! Many procedures you need to go through are actually documented with how to pics available right here on this site...DO THE SEARCH!
Stuart.