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.

The size of the pool is 6m x 25m x 1.35m depth.And we have though of going for 48mmx48mm glass mosaic tiles of different color combination. The reason is that we felt that going for a smaller tile might be too much busy on the overall looks and also too many grout lines would be seen. Wheres as the 48x48 tiles would be much relaxed in the pattern and a bit more easier to maintain. What is your take on this? Thank you in advance.

Regular window size 4width X 4 height floor to window sill 3' kitchen window size 4 width X 3 height floor to window sill 4' if low sill means stove burner of due to air

It depends on various factors like the size of the building, distance between pillars, and floor to floor height. But yes, as Joitree says, this is not something you can just find online. You have to consult a professional structural engineer