I don't know about the Paul studs thing - what happened?
Like I said, I chose Winston because he knows what he's doing, and I won't be doing anything he's not happy with.
The question atm is more about fork blades than head tubes:
If stainless, disc-specific fork blades actually exist then we'll use them... If not then we'll look at non-stainless options, and finally rim brakes. Winston's going to ask Ceeway and Reynolds what the options are (including if they'd consider a one-off order) but tbh I'm not getting my hopes up. It's an unusual request so he hasn't had to look into it before.
Either way, a 1"HT should be fine on a smaller frame like this (roughly 53 x 53).
Stainless makes sense because it doesn't rot, and discs work better in the wet. I broke my femur last year so I'm more risk averse than you might think! I've looked into disc fork options a bit and even with a 1 1/8th steerer there are surprisingly few. I could go tapered but that really is too far away from the traditional-looking frames I love. This is going to be a bike that gets used all year round so it needs to be suitable, but of course for 6k I also have to love it, and that is partly about looks. If I was all about practicality then I'd go off-the-peg, but I love craftsmanship and wanted something special made with a bit of love.