An accessory for The Mulus that puts 510 connector on top and on inside with connector for building its normal deck mount and a couple of electrode holes that alligator clamps can be plugged into.
For some reason you wanted to do all metal tank, a magnet ball could show volume of juice with magnetic metal floater in tank. It could also complete circuit for user notice and the such.
A bagpipe reed like air jet where both the attraction between surfaces and the friction free mounting of hinge pins are with magnets may allow for faster air to surface of coil without over oxidizing chamber.
A Mulus styled device with metal drip tip that pops up to turn it on, spins to adjust air flow and has solid feel and pleasant sound. If drip tip spun atomizer it could change a bottom air intake opening size without much added apparatus.
510 connecting motorized precision screwdriver with copper plating would look steam punk. Might want a swing down anchor leg so it doesn't toque its pin.
Replicable vertical coil with micro jet walled air tube up middle that extends to spit back guard which can spin to control the number of micro air jets directly on coil.