I just revisited this idea using a dual coil carto tank from madvapes, they are sold everywhere a simply DCC tanks. I cut this one down to the length of a boge carto initially, turns out this this the perfect length for the 306 sleeve that comes on the 306 attys. I put one small hole and one 18 guage hole in it and so far no leaking aside from when I put the plug in.
Working great so far!