us car tools rear spring relacation kit

i downloaded the installation instructions not much to go on how would you go about checking the car for square,making sure the rear end is where it should be,What would you do first frame connectors then relocation kit.I am putting left front floor pan in also left side inner and outer rocker panel i figured frame connectors first then weld in brace supports before removing floor and rockers install inner and outer rockers then floor then finally install relocation kit.Does this sound like the right order?thanks [ame]http://uscartool.com/wp-content/uploads/2013/05/Spring-ReLocation-Kit-Instructions.pdf[/ame]