one thing i'm not seeing mentioned.. Axle/wheel/frame Compatibility... there are several options in that area...Wheel size, Hub/axle widths, Axle Types, etc... all "options" are typically dictated by the frame, and changing the frame is not a cost effective option....adapters can be located for converting hubs from Thru-axle to std. QR, but that makes for a "pieced together" build, IMO...
1x12 setups can demand a different frame than a 2x10-11-12, etc...
front derailleurs can be tricky to decide upon too... seat tube diameter, pull ratio, pull direction, cage size, mount type, etc... all can be specific to a frame and to a groupset choice.

best advice... get the assembled bike.
second option: compile a desired end build, get a frame, take frame and list to your favorite bike shop, and have them prescribe a groupset that meets your wants, then build on your schedule.