can a 68 long bed be cut down to fit on a short bed truck?

[luke1968c10]

I have a 1968 c10 short bed truck and my bed needs replaced. I see some long beds and step sides for sale often, but rarely ever a short bed fleetside like I need. When I do see one for sale it is priced out of my budget. My question is if I get a long bed in good shape how hard would it be to cut it down and make it look right. I was wondering about the line near the top of the bed that droops down toward the back end if it would look right and line up with a piece cut out?