It would be a lot easier if the bend was across the 19 inch direction,
but I think you could still do it. Having a couple of helpers would be
good.

If you get a couple of pieces of 4 by 4 angle and either a oxy/acet
torch or a weed burner ( or both kinds of torches ). Clamp the steel
in a vise with the angle as wide vise jaws and add C-clamps along the
angle. Heat along the bend line. Wear hearing protection and beat it
with a two to four lb hammer. With that long a bend, you will have to
bend it part way and work your way down the angle. Reheat and do it
again.

You can probably build yourself a roller to put in the gentle bend.
Probably better to do that first. If you build yourself a roller,
don't put the two rolls on the one side very close together.


Dan