Thanks Mazdamn.
Made some good progress on the truck this weekend. I went to two steel distributors on Friday. I bought a 5'x10' sheet of 16ga for $93. It was huge carrying it in my full size truck, but I made it home safely without scratching anything. I also bought (4) 6' pieces of 1"x1" tubing with 1/8" wall. This will be used for the bracing of the new bedfloor. I got those for $41. I also stopped by Harbor Freight and picked up an electric sheet metal shears that cuts up to 14ga so it worked perfect with the 16ga.
The shears make a neat spiral when they cut, haha.
I put a piece on the inside of the tailgate.
Here's a picture of the tailgate and rollpan ready for body work. I filled in the gaps between the tacks with more tacks so it's fully welded now.