Fabricating a bed

[mechanixman]

Hello all, I have a 52 3/4 ton I bought with no bed.
I've found a couple pieces here, and a couple pieces there, but no complete bed. (I want to get one as cheap as possible, so those brand new $1500 beds a quite a ways out of my price range.

I can get my hands on the cross braces, front panel, and tailgate.
I guess I'm asking how would you make your own bed sides?
I can get my hands on some steel, cut out bed sides on a plasma cutter, then use a metal break to start the lip, but that was as far as I got.

Thanks