8x63 Swede build Q: reamer, barrel, which base?

The main question is where can I get a reamer made?
Clymer is overbooked and is not taking orders. I have their drawing, is there anybody else who makes custom reamers?

I was planning to use MG34 barrel for a build - is that a good idea? I know it's a tad shorter than 1919 barrel. How long do those MG34 barrels live?

And finally, I have a choice of 7.62nato or 30-06 semi auto to use as a starting point? Which to choose? In principal, I am leaning towards 7.62 as I may end up with some ammo in that calibre to burn. Technically, is there any difference in converting 7.62 or 30 cal 1919 semi to 8x63 Swede?

Thanks for your help!