you can just download sfcrevamp and delete everything except revamp_rooms
otherwise to add new levels add pics to ResourceImages.gd/upgrade_tiers, add upgrade levels to upgradedata.gd/upgradelist, and your new descriptions to main.gd
you can also open SlaveSiblingModule.gd crlt+f (ResourceScripts.game_res.upgrades.luxury_rooms) and just *2 it so each lux level gives 2 rooms