Not sure if it is a V5 but I came across this which I quite like, The Orchid X - dual coil goodness with a Kayfun like two part chamber for better wick placement:
I've got a v1 clone, 2x v4 clones and a v2 on the slow boat from China (all from fasttech). In my last order I added a couple of the v4 spare chimneys, I'm hoping that they will fit the v1 and v2 as I have loads of spare full sized kayfun acrylic tanks. Part of me wants to buy more! Plus more hanas to put them on! WTF is wrong with me??!?!
Not sure if it is a V5 but I came across this which I quite like, The Orchid X - dual coil goodness with a Kayfun like two part chamber for better wick placement: