I think you need to consult with an Architect and a builder for a project with your requirements. I think for anyone to try to make any suggestions you need to provide photographs of the project. Marie Meko

Eventually when you come to resell, a pool is an added plus. But for your own purposes, emptying the pool and adding a deck over it with a hinged door and steps placed below would be great for storage (as per option b but bearing in mind you could revert). All the best for your lovely new home.

You can't increase the depth of cupboard by just adding plywood doors. You have to apply wood to sides of the cupboard also. Suppose you have a corner cupboard, then either on left or on right side you have to add a wooden plank vertically. In this case the final cupboard will be a few inches out from the wall. It will look a bit awkward.

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