how whould i?

max i wanna start my back half.but what i wanna know is what is gonna be the best way to tie into my stock frame.and i wanna do an all tube back half.my thoughts for the rails are to make 4 of the same and each side has 2 rails one on top of the other..with gussets inbetween them..also its on an 87 toyota if that matters.thanks max!!
 
                                                                                  jason