Help with Box Mod

[Jansformer]

So I'm vaping on a K100 with a dual coil on an IGO-W drip tank. It vapes nice and has a lot of vapor production. I've been looking for a change in mods. I like the look of box mods a lot. I was wondering if anyone had a tutorial or knows somewhere I could get one that runs with 18650 batteries? I've seen videos with box mods that run on dual 18650 batts, but have never seen a tutorial on how to build or get one. Please help, thank you!