Just to update, after a very slow build I’m actually riding this now. Hadn’t ridden much in the winter and when I did I grabbed the bike I knew would work! Enjoying it though, not a weight weenie build (NX 12 speed cassette is very heavy) but was bang on 25lb.
There’s an insert in the seat tube that limits post insertion (a little way above the bottle cage bosses – 185mm from insert to top of seat tube) but fortunately my dropper is just right with it as far in as it’ll go. No other issues with the build other than internal routing faff. I opted to run a full outer to the rear mech and there’s just enough clearance on the chain stay to get it through. Used the jagwire foam pipes on the internal cables and it’s all nice and quiet.
It hasn’t cracked or killed me so far.
(excuse the state of the garden)