Finished my build, in summer form with Thundero HD 48mm it should be just under 8.5kg.
I was between 56 and 58 but Yoeleo suggested the 56 so went with it maybe it handles better.
I'm all legs and arms. BB drop is 120mm more than my old gravel bike it handles great.
Lightbicycle WG44
Quick Zephyr SSL 360-110
Ritchey Flexlogic Superlogic
Ultegra Dura-ace GRX mix groupset
Rotor Aldhu Carbon and Power2max for GRX chainrings
180/160mm discs
Titanium bolts almost everywhere