High stack, short reach, more aggressive geometry than Factor but less than Pina X
I might be reading this wrong but I assume you meant
less aggressive geometry than Factor Ostro but
more aggressive than Pinarello X, unless I am unaware of some super relaxed Factor.
Here is my only question now: which position do you like the battery located ? Seat post or low side of bottom bracket ?
If you stick to T47 or some other threaded standard (which I hope you do, I hate pressfit) my vote is around the bottom bracket 10/10 times, especially if you manage to package it similarly to the current gen supersix evo.
Also, would it be possible to print a grid on the handlebars, where the levers are fixed? I often see horizontal lines printed which are great for setting the height, but people often angle their hoods in and having the grid would allow us to set both the height and the angle symmetrically.