@"Keith Menard" I bought the full Wally sinker with pre-gates two years ago. You are easily $6500 by the time all is said and done. There are some upgrades that really matter including the air bladder sleeves at about $28 per. As @bdecker mentions, the upgraded pump if you have a long fill line from shore. Personally I would substitute a stainless 2.25” snap hook anywhere a ‘plastic clip’ is mentioned in the plans.
But for sure, if built properly, exactly as Wally instructs, it will work flawlessly. Wally is eager to help. 10 mins max up time, while you have coffee and plan your perfect set.