I'm sure you will do a good job,..since you don't have any jigs,..cut and fit all your main structural pieces ,,use clamps, tack welded stanchions , spreaders ,etc to hold her true once your ready to start 100% welds pay mind to the welds pulling,..if you have to flash cool your welds ..(using a torch brush the heat across the weld to let it cool slowly) sometimes it eliminates pulling completely