What game would be the most similar one in terms of base building?
In terms of base building, two key sources of inspiration include Warcraft III and They Are Billions.
In Warcraft III, the placement of all your buildings matters a lot, and different buildings have different levels of vulnerability, leading to varied harassment and interaction among the factions.
They Are Billions takes this concept to another level where every building has unique abilities/adjacency bonuses, and base-building is almost half the game. That being said, we recognize that They Are Billions is a single-player RTS and thus the player can be expected to pay a greater % of his attention to this particular aspect of the game. But it is interesting to think about how much of this we can translate into a multiplayer RTS.