Cool. After derringer round 2, I'll be pm'ing you.
On another note, do I remember you saying the 18mm derringer would have to be taller? That may be a deal breaker for me. IMHO, keep the same height, keep the same top cap, afc/deck wall setup, but make the AFC cyclops style. Where you have slots that can be closed off as well as a slot for single coil setups. Keep the same height, and lower the air slots on their respective rings so one could have "under-coil air" intake. The issue with height is that for a true "perfect squonk" it seems to be better when you have s small deck (with a small diameter deck and short
juice well) and short wick tails (coil fairly close to the deck). Just my $0.02.
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