Alright here are the details:
In a campaign, got downtime, wanting to know how much capital I can generate with a trade ship, using the Ultimate Campaign Downtime rules. The ship in question is 200ft long by 40ft wide by 30ft tall, and moves using steam engine running off a permanent Heat Metal and two Decanters of Endless Water (it has coal backup if we sail into no-magic zones). It has 16 sailors and 4 ship mages (mages obtained via quest, most annoying npc villians ever), though it has room for 60 people (mostly to man the cannons). Other points are it's amphibious (can beach and maneuver out of water, albeit poorly) and about one fifth the coastal cities were devastated by tsunami recently (which may or may not be our fault) :P
Now here's my question: How do I figure out how much capital this massive thing brings in when it's not carrying us through the campaign? All other rooms are accounted for, but it has 78,750ft^3 dedicated purely to cargo, complete with it's own loading crane. How would this massive "room" translate towards Generating Capital?
Edit: corrected spelling errors
I currently have 5,000 platinum to spend, and two weeks before our next session to figure this stuff out.
Edit: also, do you only earn one thing a room can provide or everything it can provide(ex: if a room generates +8 gp/goods/labor do I pick one for it to generate or do I gain all 3 (provided I pay for the goods & labor of course))?
You can split the bonus, so in your example, you could split the +8 into +1 gp, +3 goods, +4 labour.
And to answer the original question (once I had a chance to actually look at rules):
I would consider the cargo space to be Storage rooms, which generate +2 gp only, and you can have as many as 157 of them in that space (156 4-square, and 1 6-square, if I did my maths right), which translates into +314 on a check, or (taking 10) 32 gold per day.