How many tons can you have without overfilling the space allotted to the tons place? 1000? 100?
I was wondering this because it would be cool if i could use Kilograms instead since it's more accurate for missiles and guns.

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"...For what we see now is only a shadow of things to come..."

The Mass field for the ship resource right?

If you mean that, then it goes up to 32767 tons.

Metric or "English" Tons (Tonnes?) is another question.

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Three Rings for the Elven-kings under the sky,
Seven for the Dwarf-lords in their halls of stone,
Nine for Mortal Men doomed to die,
One for the Dark Lord on his dark throne