I put an actual metal donor truck bed floor in a 1960 that had a wooden bed floor. A truck bed floor looks right with the ribs. Not just some piece of flat metal. Took some "engineering". The donor floor was cut into 3 pieces and welded back together. Used a 70's long bed. May be the only 1960 GMC with a steel, truck bed floor.
Watch out for careful drivers!!! I'm away on an ego trip. Will be back on Feb 30. I'm not an Auto Mechanic, but I play one on TV. I charge $0.02 for every opinion and I take Paypal. Plan B is always better than plan A, by definition. I used to think beer was bad for me, so I gave up thinking. Sometimes no nonsense makes sense, in a sense. You can't teach a new dog old tricks. Honk if you're Amish
I have seen that done badly before, but yours looks really good. I might reconsider the metal floor.
58 Apache, long bed fleetside, V8 w/SM420 Drivable but the rear axle needs work.
59 Apache, long bed fleetside, half of an L6, 3 on the tree Bought by my dad out of a field for $100 to build with my brother. He never touched it, so now it is mine if I can figure out how to get it down from Alaska.