Welcome to the forum
https://www.instructables.com/id/Bic...-Building-Jig/
I think as long as you can get a standard English bb in both 68 and 73, you should be fine. It's hard to deal with the press fit sizes because
AFAIK nobody is selling facing/reaming tools for them.
Paragon has a ton of bb shells available, so you could match what they sell. but I think the two most standard sizes will probably do for now. It looks like that fixture is adjustable for width, so you only need one set of blocks
https://www.paragonmachineworks.com/...lls/steel.html