As far as sophia's and divers... I wish there was a carto like rebuildable that didn't require non-resistance wire
It might be very difficult in that form factor. The 6mm horizontal space is not enough to have terminal posts in one plane - hence they need to be spaced vertically. And with vertical terminals there is a wasted, but necessary travel involved for the wire that just does nothing but carry the current.
And if that current isn't atomizing, it will produce unnecessary heat if moving thru a resistance. Which in turn shall contribute to many unwanted/undesired actions. Thus, the unfortunate need of CE2 styled cups and the NR-R-NR setup.
The nearest thing possible (w/out the NR) in those dimensions is the K'fun Mini. That is as thin as it gets. Thus, unless the tank is incorporated within the Carto-RBA module it might be very difficult to have a tank-RBA without the NR, IMHO.