I think if there is a way to reduce upkeep and decay for upgraded walls, that would be much appreciated.
Twig can go out as 2x speed + 2x upkeep.
Wood can be normal.
Stone being -2x speed + -2x upkeep.
Sheet metal -5x speed + -5x upkeep.
HQM -10x speed + -10x upkeep.
Whenever I play, I upgrade my base to Sheetmetal and HQM but keeping my huge HQM base topped off with that much upkeep would be a pain
The main problem is the twig laggy bases that no one uses after a day or 2.