i had to make a tunnel for drive shaft hump and i didn,t have a roller for the curve of tunnel but i did have a scrap 40 Ford hood, measured width, cut each side of hood from curve of hood ,bend lip on bottom of curve for mounting to floor welded seam to each side of hood down the center , it turned out great and professional even .... maybe this might help someone ....
I admire your ability to see the shape you wanted in another object. But I hope it was a really bad 40 hood. Don't want people looking for hoods just to cut up. There are lots of things to bend sheet metal around, fence post, etc.
I worked in a large machine shop, we also had a large sheet metal shop. I needed one for a stock car. I cut a roof skin off a donor junk yard car and took it into work on a Saturday. We didn't have a roller that big, but "bumped" it on our largest press brake. It was a work of art. My dad was 66 at the time, he did the final cut and fit on it, climbing through the window, working around a roll cage and everything else.
I've on occasion just gone to the wrecking yard and took my battery powered sawzall and whacked out the trans and driveling tunnels out of cars. I leave a few inches of flat floor with them so I can trim to fit. On the trans tunnels I've often cut them in half lengthwise to narrow them and make them fit the car's trans better. Also cut out some off height, and bend a new lip at the bottom if they're too tall. Gotta do whatever if you don't have all the cool sheet metal rollers.
A welding tank works great to roll a round shape into a piece of sheetmetal. In fact, anything round works well, just use your body to get the sheetmetal to start taking the shape, then go from there. I've used light poles, telephone poles, support beams in the shop, etc.
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