Converting Lexington hulls into fast supply ships

How could the unused Lexington-class battlecruiser hulls be turned into fast supply ships?

Remove the guns and armor, use magazine spaces for fuel, build dry-storage volume above them, and retain the fast machinery.

The discussion begins by stripping the incomplete capital ships down to useful decks and machinery. Protected magazine spaces could become fuel storage, while lighter dry stores occupy higher enclosed structures. The resulting ship would look boxier because cargo volume and access replace gun arcs and armor geometry. Keeping the powerful propulsion plant would create an auxiliary able to accompany fast fleet units.