I ended up picking up a Pheonix v4 (Chinese-made mini-ERA) to practise building coils so I'll be ready for the Super T one, when it's released. As a nice side-effect, it looks GREAT on a P+16340 with tapered cap . . . almost seems like it was made for it, with the exception of the centre post, which is a bit too long. For my updated perspective, perfection would be to take that design, and increase the diameter of the deck, and integrate it into the cap, with rhodium contacts.
Oh, and a side effect I've not particularly pleased about: it's not as battery efficient as a low-mass pre-build [edit: pre-built] atomizer. I'm hoping that an integrated design would balance out this flaw, but maybe a new debate will emerge: Low-mass vs high-mass RBAs