To begin with it was a pain in the arse getting the top of the vapeshell chiney through the top cap seemed near impossible but I forced it by pushing down onto a worktop.
Once it was all assembled it started giving "check atomizer" message on the screen. I noticed the top of the tanks lid was higher than the top of the vapeshell chimney so the 510 nut couldn't make a connection. I sanded the top of the lid down a little to the chimney was slightly protruding and I've had no problems since.
It could be difficult for vapeshell owners to get it set up but I think its worth the mess about to get it there. Most people don't seem to be having any problems so I wonder if its the vapeshells or the tanks that are a little inconsistent.