Then the original floor from Ford was plywood, 3/4" thick. You can go back with that. That's what I'm doing because of cost ($34). I looked at sheetmetal and diamond plate but that's to expensive ($473 + $120s/h). The wood kits are more for show trucks, plus they use 7 boards and you have to redrill the crossmembers.

If you go with one of the wood kits I would stick with pine and paint both sides. The company the Matty suggested had the most helpful people I talked to compared to others.