It's possible to make something, but you're not likely to find just what you need.
I have drawings and (had) intentions of making that style flat bed in aluminum, beaded sides and big rounded corners and all.
I was looking into having the sides extruded, and the corners would be fabricated and turned as a circle with the correct profile on the lathe, then cut into quarters and welded to the sides.
Probably would be expensive, and in the meantime I found a suitable steel bed.
Grigg