Thanks Talroth. To be honest, I usually guesstimate at the crew number. In this case, I'm assuming the various barracks have bunk beds and the named crew quarters fits 1 each (i.e. captain, first mate & doctor). Then I usually assume a number from minimum to maximum. In this case, I would say maximum crew allowance is 55. I usually allow room for some redundancy in crew numbers (there would be various shifts to keep the crew fresh). I also take crew number ideas from comparative real naval ships and various spaceship designs.