Thanks for all the dopamine hits folks. So here's an update:
the seatpost has arrived, typical Nitto finish;
settled on the Dream Risers, with a panda-ish Zipp 110mm stem on order.
installed the Allygn (struts uncut till it's all finished) and the FD DT shifter. It's refreshing how unfussy the fork crown area looks without rim brakes nestled under the rack.
will replace the factory m5 dome bolts (3mm heads, why!!) with 4mm brass cap heads from the Riv, except for the pair of load-bearing rack bolts.
Thanks for all the dopamine hits folks. So here's an update: