Here's a pool conversion to a pond there is also a brief build of the ohio fish rescue where there is a more detailed build somewhere i have been unable to find it again.
Got to love when you have endless purse strings. I would have hands down used cinder blocks for the retaining wall. though they would not be as stable as the aquablocks until the backfill was on both sides of the wall. a little mortar would solve that the wall could have been built in a day and dry over night.
I ALSO QUESTION IF THE 6 Blocks around the pump vault is needed as it is all in the pool and should never run out of water . though i guess the fear would be that the rock may clog a bit in time and the pumps may drain out the vault. they are the experts. I'm just cheap