That nano is terrific. I never knew of that model. Here's probably my favorite GG of all because of the incredible stealth characteristics and knockdown power. This is a standard GGTB in Nickle which I cut down to fit a single 16340. I bring this with me on planes and board meetings all the time. I use it to fire up an Ody dripper with a 1.4 ohm coil and it hits great. I can get 6 good hits on the Ody which is enough for a restroom run...
Here it is in comparison to a standard GGTB which which I've wrapped in Ebony veneer. Her name is Woodie
The set up is really tiny but will easily last a nine hour plane ride. I put in a slightly stronger button spring so it rides comfortably in my shirt pocket without having to lock it all the time.