Future generations university and RCBI in Huntngton Wv have a rocket stove design made from a 55 gal drum for small producers to boil on. I saw a demo last winter at a seminar. Hard to believe how fast it comes to a boil with such a small amount of wood. I'm sure you could scale it down and finish on it. Good luck, let us know if you buid one.
2012 15 jugs
2017 125 3/16 - 18" x 72" drop flue
2018 240 3/16 - Deer Run 125
2019 450 3/16 - Converted RO to electric, PC 330 pump & added a membrane
2020 600 3/16 - Maple Pro 2x6 Raised Flue, added AOF/AUF
2021 570 3/16 - Built SS steam hood, Smoky Lake SS filter press
2022 800 3/16 - Upgraded RO to 4 4x40, PC 660
2023 800 3/16 - Re-upgrading RO, building preheater