How do you plan on heating it? Electric, gas, passive solar, etc.? Are you planning on covering the pool at all with, say, a greehouse top, hard structure, or tent top?
The sand filter will likely have to be upgraded since the pool filter is designed for no bio-load. And, you'll have to cage the skimmer intake to prevent fish from getting caught in the intake and basket chamber. It would also be a benefit to raise the floor drain about a foot to prevent it from frequent clogs and use a pool/pond vacuum to clean out the large gunk.
With no chlorine to keep algae down, stringing out netted rolls of barley straw near the outflows will help keep the green down.