Ship Design Philosophy

I would speculate it's origin is Trillion Credit.

Trillion Credit Squadron 1981:
Collapsible Tanks: Large fuel bladders can be used to hold additional fuel; the
collapsible tanks are filled with fuel and take up space in the ship's main cargo hold.
It must have a hold equal to, or greater than, the tonnage required for the collap-
sible tanks, and the tanks displace tonnage in the cargo hold when in use
 
Starships: Accommodations and Fuel Storage

V. If it's intended for additional fuel storage, access is by UNREP to the primary fuel tank, through the hull.

W. If it's for personnel or cargo, then either hatch(es), or airlock(s), through the hull.

X. We don't know if the external cargo mount is airtight, but we'll assume it isn't

Y. More important, if the side walls are solid, or just rails that corral the cargo.

Z. It's certainly implied that there are gates or hatches that allow access.
 
Starships: Accommodations and Fuel Storage

1. Alternatively, you could switch out the fuel bladder with the mountable fuel tank.

2. These tanks are used to convert cargo space into working fuel tanks with all the pumps and feed lines required.

3. Fuel can be used directly from these tanks, enabling ships to make longer jumps than they would be able to on their own tanks (however, they are still limited by the capability of their jump drive).

4. When empty, these tanks consume the same space as when they are full and cannot be used for anything but fuel.

5. It takes four weeks to add or remove mountable fuel tanks to a ship’s cargo spaces.

6. Unlikely you can use the organic plumbing to penetrate the hull.

7. I'd say if you can flush out the tanks, you can use them for something else.

8. Essentially, you're still installing them in a cargo space, just that it happens to be exterior to the primary hull.

9. Being (pre)installed in an external cargo mount, installation time is what's required to attach the external cargo mount to the primary hull.
 
Starships: Accommodations and Fuel Storage

A. You might be wondering, if we have to cut into the mounted tanks to gain access.

B. These are containers designed to float within the hydrogen fuel tanks of a ship and are harder than concealed compartments to detect, as even a thorough examination of the ship does not detect the compartment unless the fuel tanks are opened and searched.

C. Such compartments can only be accessed when the fuel tank is at least three-quarters empty.

D. Apparently, there are fuel tank hatches.

E. And likely, large enough for tonne lots.

F. The plumbing can be partially converted to include air and heat.
 
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