I figure I could make a pretty good go of making my own jig, esp. since I'm good enough at CAD and have some friends with 3D printers to make some clever parts. You could go a long way if you already have some basic shop and carpentry tools like a caliper, a drill press, a miter saw.

I think Calfee are thinking ahead about bike styles. One of their videos showed that the tool kit has spacers for a bigger head tube, and I thought I saw something with Boost spacing.

There's about an hour of instruction videos, I haven't watched them all yet but confident that if I did I'd be well on my own way.