DIY floor pans.

Here goes, I admit I did not read all the advice, info, bickering maybe. I have fabbed many floorpans. Yes the best of all worlds is just buy good AMD pans but..

Use 18 Ga. mild sheet steel. Around here costs about $60 4 x8. .023 mig wire w gas. That rusted floor is thin and it will be hard to weld even when clean I bet. Clean the old pan GOOD where you plan to lay a bead. I use a large wire cup, maybe 4 inch dia to clean that rusted pitted metal. I will use Ospho to clean this pitted metal. It make nasty fumes speciallyif not totally dry before welding! NOT good to breath! Use a second coat and wash off with water to neutralize it OTHERWISE you might get a reaction with your primer. I use a right angle grinder with a thin cutoff wheel to make my cuts generally. Get a sand bag to help form the pockets etc. Find a good solid angle iron like maybe on your car trailer use some c clamps use to for angle bends. I use splices to make the pockets, IF you an find someone with a bead roller to give it strenghth ribs that would be great. You will get better at it as you gain experience!!