black is bad, sucks the light out of the room

in my space grey concrete walls and floor works quite well

don't worry about painting black around the enlarger, not necessary

large sink, yes 8ft long 20" wide as a minimum
large workbench with drawers and lower shelf 8ft long 30" wide works well for 2 enlargers and extras

here's my setup after moving sink to current position, but before second enlarger