yes because with all that time and effourt it seems really silly not to have done it, especially with all that power and torque. the shell will be floppy as hell after a few seasons, even with a cage. seam welding will help no end.
undoubtably an increadable car, and a lot of thought has been put in to many aspects of it. its just a simple thing in my eyes that costs nothing really other than time, but makes one of the biggest differences.