Oh crap, I forgot one of the v band connections will be in the middle of the 2 1/2 pipe before the X pipe. Then another just before the mufflers.
I will weld the 2 1/2 pipe the collector let it cool in place. Then put in the V bands, let it cool, cut the pipe and weld in the X pipe. If I put it all together the welding heat will draw it all out of shape. So I will do it in stages, let it cool in between, that will allow me to do the fitting with cool parts for better fitment in each stage. I sometimes say it like it all magically fits together, and forget some of the guys reading this are not fabrication specialist like myself. So sorry! Once I am doing it, I will take pics in stages and list precautions to do a good quality job!