Again we don't learn much about critical factors that give a recipe integrity.

Despite that lack of integrity, you did a really good job on the BIABacus and. I dare say, it looks like you can run with it.
Review comments on the recipe at the beersmith site say the same thing about lack of instructions. I guess if it is a limited availability kit they can get away with that. However, one reviewer is going to be disappointed that he cannot buy the kit again and again if it is truly limited. [Stock up now! limit one per customer]

Of course your notes from your brewing this will establish a new level of integrity for the passing on of the recipe.

This is one complicated recipe with a very long time period involved until the final drinking. I think that the prolonged waiting time will work in your favor, provided you start with good quality ingredients. It will all mellow out and stands a good chance of giving what is promised. I see that your 10.68 gallon kettle will have only 8.84 gallons of mash volume in it. Is there a reason that you didn't increase the VIF by at least a liter to get more product from the same amount of work & time?

If you ever brew this and remember 16 months later to post about the results, it will be interesting. If you also happen to brew a style that can benefit from long-term storage in bottles you might find that the recipes need not be as complicated. I made a ginger porter in December of 2016 and it is much better now than it was earlier, but there's only two bottles left. Old ales also lend themselves to aging. One with raisins from 1 year ago has stabilized, the one with prunes (yes, prunes) continues to get better at 9 months.

Good luck, Tony!