Any question answered...

That or change the lower cup to ZS44/30. The latter looks better, but it changes the geometry slightly so you need to decide whether you like that idea.

Also which crown race?

The 40mm (for 1½") crown race if you use the reducer you picked out.

Yes. Installed that thing last week.
I don't know why because I couldn't find my verniers, but it was not fun.
Hope thing in oven, put on steerer, hit pipe with hammer, get nowhere, get round file out, heat up, hit with hammer, repeat many times.

Of course this might work way better with a pipe thats not from a vacuum. Or a fork thats not one of the low trail masis from Alb/Cake.

Its on now, rides nicely but now theres the problem of the headset sticking out like crazy. I'll need a very long washer to install the rack.