But seriously, folks... it does make better sense on a hybrid mod, where the atty didn't come off. You would not then be limited to a cylindrical form factor, nor have to dedicate the center of your connection to electricity, nor yet build all your connections in a concentric manner. You could put things where they made sense to go, avoid some voltage loss, and build a mechanically stronger box/atty connection. If you fed make-up air through the base, directing it in separate streams to the bottom and side of each coil by "towers" on the base, you could build an atty that would work equally well as a cloud or flavor chaser, or selectably use any number of coils up to the maximum by adjusting air flow; and it wouldn't have to be gigantic as the air adjustments could be on the mod, not the atty. If your mod was metallic, you could cast or machine your atty base integral to the case. You couldn't break that with a sledgehammer.
And dumping the 510 for removable attys is still a great idea. I envision a cam-locked, keyed, bayonet type fitting. Taking a 22mm diameter atty as standard, you'd have at least a 16mm diameter contact patch to locate two electrical contacts, make-up air flow, squonk tube, pressure sensor feedback contacts, anything desired. Air and liquid tubes could use machined or investment cast tapered quick connects with o-ring seals to eliminate leaks and the need for a "spilled juice" well common on squonkers. Electrical contacts could use pogo pins for better contact. If the cam-lock ring could have a 22mm ID, the contact patch could be 18, maybe 19mm in diameter. And compated to a 510, it'd be he11a strong, offer better service life, easier to maintain and-- if keyed-- idiot proof comes for free.
Just a thought...