Post your info on a homemade 4=link

Looking to build my own 4 link set up for the 71 swinger! I would like to here about pro's and con's from some of you guys that have done this job. I'm pretty good with metal work and measuring twice before hammering something down with a weld. I want to set up my own 4-link something to the street-lynx set up. I was thinking about using rectangular tubing for the cross bar shock mount etc.. This would be my first 4-link set up/ Just curious from people who have experience doing this would it be better to mock it up and tack before tearing the old junk out? If this set up is going to be a major pain I might go ahead and fork the money over... I would really like to do this and save the extra money for motor/paint etc... Any suggestions are welcome!!!!

Chuck