some thoughts about this change from the perspective of a builder:
I have 4 accounts, 2 are paid and 2 on alpha/beta keys. With maxed out skills i could maintain 168 cores under the proposed changes.
1. Currently i'm holding around 25 tiles with mining units, that makes 25 cores alone - if mining units would work like territory scanners (3 on one core can scan 3 different tile) icould easily half that count.
2, I have a runway consisting of more than 20 cores - if there were cores that have other dimensions than a L-cube (not 511³ =133,432,831voxels) - let's say 2500x1000x50 (125,000,00 voxel) i would only need 1 or 2 cores instead of 20 to build a runway, a street or a bridge
Please use more intelligent ways to reduce the amount of cores needed than simply take them away from the players, you will kill creativity and piss on the work and effort many have already put in this game.