Stainless steel is more difficult to cut, roll and weld than cold rolled steel.  Back purge welding is required when welding stainless or the pipe will crack in the welds.  I know how much time it takes for us to make a HPR 19 with patterns.   Looking at your craftsmanship I think that I can see at least 25 to 40 hours of passion on your good looking project.

Stainless steel does not transfer heat as quickly or does not store as much heat as cold rolled steel.  These two facts will make a stainless steel pipe of the same dimensions and thickness as a steel pipe, come up to temperature a little quicker and will shift the power and torque peaks to a slightly higher RPM. 

I broke the labor up into small enough chunks, that I have no real idea how many hours I have in it.....but it is a lot. It is truly a labor of love.

 I work with stainless almost exclusively, so for me it's almost easier because I know exactly what it's going to do when working it. How much it pulls. How it flows when welding. How the set the welder for a perfect purged burn through weld....etc.

It came out pretty good, but the perfectionist in me wants to cut it all apart and roll the pieces back flat into patterns. I know if I did, and cut all the shapes out of flat metal, rolled them and fit them individually, it would come out better. Cutting and grinding the pieces to fit like I did left me with some pretty big gaps and significant differences in diameter between some of the pieces. But I'm not going to do that. Lol

I remember you mentioning the slight predicted raise in the rpm of the power curve when I asked you about making my hybrid pipe out of stainless. I don't want to sacrafice any potential power on my hybrid, but on this zilla I'm not too concerned. When I finally finish the hybrid the zilla is getting a ground up restoration and a stockish engine put back in it. It's going to be low maintenance, play bike.