We have a new 21' round x 4' AGP and are about to start constructing a deck around it -- like, tomorrow hopefully. Technically, we have most of the deck (large deck attached to house), the pool is installed next to it, but there's a 20 inch gap between existing deck and pool that needs to be filled in. We also have planned for a walkway all the way around. I read somewhere that digging next to an installed pool is a terrible idea because disturbing the ground after installation can cause stability issues with the pool. Is that true? Father-in-law (who is a carpenter) and various well-meaning friends/neighbors are adamant that the 4x4 posts should be sunk in concrete footings rather than up on blocks. Also, this pool is on a slope (18" difference between the deck side & the other end) if that makes a difference.