If I was king…

It’s the way I’d set it up.
T1 cauldron and a rack to dry. Only works for dying.
T2 cauldron and stone vat, 2 drying racks. Dyes and paints.
T3 2 cauldrons, 2 stone vats, 3 drying racks and a chair. Dyes, paints, and tattoos.

But each could handle a full armor set to dye rather the one peace at a time. I get that it’s not very RP to dye worn armor, but lets no make the operation 5X more complex for no reason.