It wouldn't be very complicated to make one of these at all.
I just recently got one to try out cartomizers for the first time, and frankly I adore them, so I'm thinking I'll be making my own adapters in the future.
All you'd really need is a dead 901 (or kr808d) battery, a dead 901 atomizer, soldering iron and some small gauge wire. Granted you need some skills, proper tools and determination to gut an atomizer, but it can be done.
I am not that talented in the electronical department, so I would kill the thing, before I got started. HA!
Thanks for the info though, will keep it for future reference.