Draw a scroll to the size you want on to some scrap sheet. On the inside line put some 10 or 12 mm bar off cuts about 20mm long on end and tack them on. now take your bit of flat and weld one end to the inside of the scroll(first bar ) then bend the flat around the rest of the Patten of the scroll cut the flat to the length you want and grind/cut off the weld in the middle you should now have a rough shape for a scroll once you have adjusted it to how you want weld it on to some sheet inside edge only you now have a scroll jig from there you can make as many as you like and any size by bending them out bigger
Machine mart sells scroll jigs
I have the better ones the scroll formers and a basket maker and never really use them as it’s quicker and easier to buy them