This is a small modification that I have made to the SE-03 because I'm dropping the firebox out on a regular base's because I'm mostly using hand sanitizer gel with 75% ethanol as it's worked out for me as just the perfect fuel for this steam plant with plenty of steam pressure and good powerful runs for around 20 minutes. A simple mod turning down some brass and parting it off so that the risers were 3mm gave the perfect clearance to the boiler base of the plant and now the firebox is a quick and easy removal.
https://www.youtube.com/watch?v=BKJi4JgKCtA