That's looking better! If you can find an old washing machine or dryer the sheet metal on them is just the thing for flat repairs. They are coated with GOOD enamel. Make a template of the hole you are filling, cut the piece from the sheet, grind back an inch of the paint and weld it into place. The enamel they use really holds the primer after you weld.

They are not so good for any bends because the enamel tends to crack at the bend.