72 bed floor question - fleetside long bed

[Fl72Custom10]

I've searched the forums but haven't been able to find the answer to this question. I'm in the process of restoring a 72 Custom 10 long bed. I have almost all the parts except the bed floor. The existing floor has rusted through. However, the sides are perfect so I hate to replace the entire bed. Is it possible to cut out a floor from a newer 8' Chevy/GMC bed, or a 67 - 72 if I can find a good floor, and have it welded to the '72? I don't want wood and I'm planning on having a spray-in bed liner. Thanks in advance for any advice.