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Scenario: It's 1927, and the US, UK, and Japan are finally getting around to signing a naval disarmament treaty.

The United States has three carriers: two Lexington conversions and Langley, as in OTL, for a total tonnage of 83,500 tons.

Japan currently has two carriers: OTL Hosho and a never-realized carrier planned in OTL for a total of 21,000 tons.

Japan is required to scrap the following under the terms of the treaty:

OTL planned battleship Kii, 40-60% complete, original design 42,600 tons, 820 x 101 feet, 29.75 knots.

OTL Fuso class, Fuso and Yamashiro. 30,600 tons, 665 x 94 feet, 22.5 knots.

OTL Kongo class, Kongo, Hiei, Kirishima, Haruna. 27,500 tons, 704 x 92 feet, 27.5 knots.

All figures include speed and tonnage in battleship/battlecruiser form, not reduced to reflect the weight of a carrier modification.

As you may guess, here is the question. If Japan is allowed to build up to 60,000 tons of carriers total, what is the least expensive and most effective way to take these hulls and convert them into carriers to maximize tonnage?
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