Bed Floor replacement...

[Harpie]

Hey guys I am currently trying to figure out the what I should do on replacing my bed floor. I have a 71 SWB with excellent cab and front clip but my bed is horrible! I really need to replace the steel floor and front header panel and I have access to a great long bed with a good floor and header. Has anyone robbed the floor before and shortend it? My grandad has a body shop that I can use to do whatever I need so that is no big deal. Just didnt feel like spending an arm and a leg on a new floor. I would post pics but I cant post from work so ill try and get a few pics as soon as I get home. Ill be starting my build thread in the next few days and I am just trying to get all my ducks in a row before I start tearing into this ol girl. Any help will be greatly appreciated.