way too thick!!
Geezz..the FRAME ain't even 1/4"!!

..thickest stock I ever used was an old 275 gallon oil tank sawzalled to size..and it was a BITCH to bend and work with!(about 3/16" thick!)..I ARC welded it in without burning through.

--after I was done,I swore I'd never use metal that thick ever again (not that I'd have to on that truck !)..
I've used 16 gauge galvanized sheet metal I got free from old freezers from a warehouse years ago..36"x8'3" long,and I got several sheets..patched a LOT of floors and door bottoms with that stuff..got sick breathing the zinc fumes too..be careful when brazing or welding galvanized..use a fan,and do it outdoors if possible..a respirator would be a good idea too..I was sick for days after fixing the floors in the first truck I used galvanized metal on..
I've used metal from old washers and dryers,refridgerators,and heating ducts from the local landfill's metal pile--also sheet metal from furnaces and hot water heaters,and a filing cabinet or two have found their way onto the holes in many of my rotted relics....(once as a teen,I used old snow shovels,hammered to fit, to cover the holes in my 56 Chevy pickups floors!)..
I found the epoxy paint on the appliances holds up good to outdoor exposure..plus its FREE!

...galvanized is worth using,IF you can weld it safely.(or use screws or rivets instead)...around here,its all that lasts more than 2 years..and you only have to paint the areas you welded..the galvanized parts never rust very much..
