Thanks bohoo for starting this thread. It motivated me to do this.
GV shell IS threaded to go on an eGo BTW. I didn't use it like this though. I just pulled the threads out, really easy on these shells. and slipped my pre made tank into it. With the added clear piece inside the shell, my tank fit snug as a bug in a rug

Measured, and cut.
-My tank is a syringe "container" modded with a CE2 connector. It hold 2.5ml. Left the center post on and bent it to run up side of tank. heat shrinked it. Then I soldered another post to the - side of the connector, and it runs straight up. Cut my needles the length I wanted, dropped em in the hole of +/- posts, and soldered to secure.
-Used the Putty again, and it seems to be holding up OK. Need to build a delrin plug or something so I can reuse it.
-Top piece is from the shell, cut down about 1/4" and using a rubber tip from a DC cartomizer. A 601 tip and a eGo-T type B, and of course drip tip will work also.
My coil is 7 wraps of 32 gauge kanthal. Ωs are to high on this one as I get about 2.8Ω and am compensating with the ProVari.
Needle setup does work OK, but would prefer a screw setup. So that is next for me.
Quick question on wicking. My experience has been with the A-2 and the tank being on top, I had no issues with wicking. With this I am. I made sure it was a hollow tube wrap (straw), I tried with it going all the way to almost the bottom of the tank, and then I tried about midway. I seem to be having a problem getting it to wick decent. Any recommendations? I am using #400, maybe try the 325 (I think that is what it is) I have...
And of course mandatory pics....
Also I discovered the 3ml dropper bottles fit perfectly inside an eGo batt tube... MVs has eGo batt tubes for .59 each...