most swingers ive seen are near 7 benjamins if not more. i cant imagine the material anywhere near that much. mostly your paying for labor time to cut, bend, fit and weld. but the problem i see is if you have little to no experience welding steel in a structural application, specifically tubing. may want to practice on some scrap pieces first. ive welded a bunch of aluminum but never any steel tubing so i cant offer any first hand advice. might be some gas purging process youll have to do on the inside but im not sure.