I used a zapap for about 4 years and still have it. I used it a couple of years ago when I had too much malt for my 10 gallon Imperial stout.Gettin set up to start my first all grain adult beverage.
Maris otter/Cluster SMaSH
Should be interesting. Finished up my zapap MLT this morning.
Good luck with the first attempt. One hint is to have extra water on hand, both hot and cold to help you get the right strike temp.