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Depends on your intended fork travel and use, innit. Static 67-68 deg with a 120mm fork and effective seat angle from 70-74 as per preference would be great for pedally, cross country, bikepacking stuff I'd imagine. Longer travel forks and winch and plummet type riding suits slacker 65ish head angles, and steep seat tubes to keep you over the front while climbing. All personal taste really.
Only thing I'll say is 420 seems like a very short reach number. My 18" Kona Explosif was 424. My PP Oka is around 450, lot of XLs closer to 470, keeping a stem length under 70mm I will begrudgingly admit is actually quite nice.
I have no idea.
I am just making it look nice (atmo) and trying to be sensible geometry wise.
Suggestions for geometry tweaks welcome.
Sam at Stayer tell me I need to slacken headtube to 65 and steep seat tube a bit