What have you come up with so far in an Internet search of pool products and accessories?

Maybe you could identify the dimensions (not gallons, but sq footage of surface) that was part of your other post. That sets some criteria how much "material" would be involved and ways to think about material bulk, weight, and storage of said structure in other seasons. Also might bring to mind whether you would cover the entire pool, or a portion + have a safety retaining wall, or what.

My father once helped a bunch of other guys build a booth to be used at the State Fair for fund-raising. He developed the design so it would be built in sections and bolted together in order to be stored elsewhere during the year.
Of course it had some kind of plywood walls and these had to be stored in a dry place.

So perhaps there is some design of a framework and separate flooring bolted together. vs. sectional decking of some sort. Or you might be able to create a framework and then think outside the box for the "flooring"--perhaps removable mats of some sort rather than a rigid material. What would be the weather issues and storage requirements?

Oh, that would be cool!

You'd want to blot together the perimeter and any support required under it. Then make the surface into modular panels (up to 4' wide, depending on how big it is/strong you are) and just place them on top. They'll be heavy enough that you won't have to attach them to the base. I'd use composite materials--they'll be more dimensionally stable for such an application!

My usual slow-to-warm-up self says that this is impractical for a pool of any significant size unless you have mucho $$ and an identified storage site, and that you have actually identified that the pool does not work well for your family's use of your property, but nontheless, it is reasonable to try to research the options. That may either get you to the product you desire or help you come up with a whole 'nother way to approach your living situation.

There are some commercial products for this purpose advertised on the 'net. Dimensions are likely an issue--as in the above post, it would take different support structures and materials to span a large pool vs. something smaller.

Also, have you focused on whether it is for repeated off-season uses, thereby requiring movability and "storage", or whether you wanted to keep your pool completely fallow for several consecutive years and then rev it up and dispose of the cover structure? That affects the design and $ issues.

I say "storage" because one unique product I saw was a gazebo designed to slide over pool and then off to the side and be usable there. Whereas, if you have no other yard to speak of, then you have a different issue.

There are also some previous GW threads on this issue.