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Keep the original fused service but feed a sub-panel from it - this will give you the extra circuit space you may want for additional lighting/recep loads and the ease of working with circuit breakers.
There is an assumption here (this is a cabin) that you do not have a lot of 'load' on this service, so adding a sub-panel is more of a convenience for additional circuit wiring rather than adding substantial load to your existing service.
Obviously, all this depends on the particular kind of fused service you have.