Maybe track 'structure points' as the total number of surviving structures at game's end which were built by the winning team's builder(s).
Structures away from main creep / power shouldn't count, but the things that provide said power/creep (awesome punk band name kthx) should, like repeaters and forward eggs.
So on ATCS over the course of S1 thru S3 as a Granger

I'll build (usually in this exact order):

Egg, Tube, Tube, Tube, Egg, Tube, Booster, Trapper, Trapper, Egg, Egg = 11 structure points
And as CKIT:

Turret, Turret, Turret, Arm, Medi, Node, Turret, Node, DC, Tesla = 10 structure points.