In line with the lore:

Boulder City Memorial cannot be built until 2077 ( When Caesars legion attacks )

Quarry Junction can be upgraded like in the lore, to start producing limestone, this lowers construction times of forts for the NCR or controller.

The NCR Correctional Facility products an initial state-wide construction bonus ( Penal labour ) to building infrastructure, if upgraded, this increases to the point of providing overall building buffs in the state, as stated in the lore. It will also lower local state resistance and improve compliance at higher upgrades.

Vaults will output a very minor supply boost, and if level 3, provide 1 power now.

Finished all 29 monument locations for mojave area.

next plan is to make the ncr monument be buildable only by them after the lore date for a bonus.