We had priced out 18X36 everywhere just because it was considered standard. On a whim I asked how much the 20x40 was going to cost and to my GREAT suprise it was $500 more in concrete and everything else cost the same. We got a rectangle like yours and i imagine a curved liner would have been another extra charge but that $500 was the best $500 i ever spent.
We re-did the Trex deck about 3 years ago. I'm *hoping* that we will use the lower level sliders more and that will be our main point of entry for the pool. But great idea about the deck steps!Once you’ve recovered from this project financially, put in wider steps down to the pool. We did our deck and sliding glass door a few years after and went with 6ft stairs for an open unobstructed view from the house. It really makes a difference.