I think doing it right would be more work than it's worth. You would really need to build a precsion jig to assemble it. Otherwise getting the geometry right would be a problem. You'd have to build both a left and a right jig. No way I would fuck with all that unless I was selling them. By the time you pay for the jig, buy the 4130, and then pay to finish them, you could have bought3 sets.
The only good reason to build shit yourself is to get things that nobody makes. To get things exactly the way you want them. Then the cost is worth it. I've made things now and then that saved me a few bucks, but most of the bigger stuff always ends up costing more. YMMV
2007 SR5 Tacoma Access Cab, V6 - 6 Speed, twin stick FJ T-case, 4.56 gears, ARBs at both ends, 2.5 Fox C/O, Timbren bumps, expedition rear leaves, Bilsteins, URD shifter, All-pro IFS skid, All-Pro sliders, ARB front bumper, CBI rear bumper, Puma OBA, Wet Okoles, Weathertechs, Scangauge, GPS, Escort.