Modding an atty for BF: An ECF thread with pics, and another. Have a look and I think you'll get the idea. All you need to do is make a juice path from the bottom of the atty to the deck. These two are done with files and Dremels. I prefer to drill holes but I have a drill press which makes that a lot easier than without. Here's Eddie's post on how to do that. I like that I can easily drill two outlet holes for juice, one on each side of the center post, because I almost always use dual coil builds.
Note that the Vmod uses an O-ring under the atty bottom surface to seal things.
As for mod conversions, have a lok at FatDaddy Vapes. Scroll down til you see

I think he also sells just the 510 positive pins for his other connectors also. A little further down that page you'll also find a bottom feeder bottle kit and a rda BF conversion kit.
Hope that helps a bit
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