It says on p22 that a ship may have one airlock per 100 tons (or part thereof), and additional airlocks may be added using the system in the spacecraft options. By my reading this means that a 200 ton ship would naturally have 1-2 airlocks for free, and incorporated into the design, and if they wanted a third would have to pay and allocate tonnage, right? I'm a little unsure because various ships later on have an airlock and tonnage and cost added - e.g. the Gig (p94)... although it's only 20 tons, by my reading of the rules it would automatically have 1 airlock (per 100 tons or PART thereof, 20 tons would thus be part of that first 100). So is that airlock a second, additional one, or has the only airlock been manually added (perhaps I missed something about small craft not counting, or there has to be a 100 ton minimum for the free airlock)? So if I was building a 200 ton Fast Trader could I assume it has 2 airlocks as standard, or would I need to buy them?
Which leads to the 2nd question - the book says in the airlock section of both spaceship and station design to look at the cargo airlock rules on p39 for info... but p39 has no cargo airlock rules! The Far Trader has 2 Cargo Airlocks at 6 tons and MCr0.6, but the merchant cruiser has one 4.5 ton MCr0.45 airlock. Do I assume that this makes it MCr0.1 per ton? But how much tonnage needs to be allocated? Is it arbitrary, or fixed? The Far Trader stat seems to indicate each Cargo Airlock is 3 tons, MCr0.3, but the Merchant Cruiser would go against this.
Please advise. Thanks.