I saw your earlier post about this. Looks cool. Is this something that the parts can be bought and just screwed together like the small 510's? I'm really new to this and kind of lost on what fits together. I appreciate your help.
The sockets that the carto screws into are available on various websites. You can easily and cheaply buy anything you need to make one. Some units have fancy stuff like voltage regulators and stuff that lights up. Mine is as basic as it gets, just a battery connected to the two wires on the socket with a switch. If you're using 510 cartos you just have to make sure you get a 510 connector to screw it into. There are lots of places that sell parts but this is where I buy from a lot. DIY Parts
For a first build, I'd recommend looking at some of "box mods". They are basically just a small plastic battery box modified to hold a battery, switch and a connector.