Drawings would be a nice addition to our library, if you are willing to share. Of course, they would remain your property. I'm sure several here would love to build one like yours. Looks very good.
I used to do a lot of that in 316/316L tubing to spoil our TIG guy, but had a spare Enco clone, so just kind of left it set up for it. We didn't find any of the HSS saws that held up well in the stainless, but Starrett offers a carbide tipped saw that is very durable. Not sure I'd want to try it in a hand-held notcher though. Pretty expensive.