Budgeting for a Bike Build: How Much After the Frame?

Hi everyone. I'm building a gravel/bikepacking bike up and having a custom frame+fork made. The question I want to put to you is: how much would you budget for everything else on a 1x Di2 build? I mean drivetrain/seatpost/saddle/wheels/tires/stem/bar/bartape/brakes/pedals? I'm talking just the bike, not travel or maintenance gear. I'm pricing things out myself now, but it will help me (and maybe anyone else thinking of going down this path) to have an idea of what everyone else budgeted. And I may have forgotten something that you'll remind me of :lol: