I want a way to copy rooms :) Making 12 GPs is boring! Maybe I can start ignoring prestige and the 1% training because I’m tired of putting posters on walls.
This guy did some testing, furniture effects do seem to stack:
“each medicine cabinet adds 2% to the room upgrades score and ~0.5% to the chance of cure score. The medicine cabinet is stacking additively with the upgrade score from the Drug Mixer II that’s in the room by the looks of it.”