I have a Kamry K-1000 epipe. The bowl typically holds the battery with a push-button to fire. The
tank becomes the "stem" of the pipe, and you can get a long drip-tip (that looks more like a pipe stem) or just use whatever drip tip comes with your tank. From what I can tell (but I haven't researched extensively) most pipes are mechanical mods (i.e. unregulated) so you'll want to make sure you're using GOOD batteries (typically 18350s) and have a GOOD charger for said batteries. Also be well-versed in battery safety and Ohm's law as it pertains to the resistance of the coil in your tank.
I've not come across any models where the "tank" is actually the bowl of the pipe. My Dad smoked a pipe for years when I was growing up. I love the "look" and the smell of a real pipe. The K-1000 is sort of close. I'm not clever enough to design one that could imitate that, but I'm sure there are plenty of smart people out there who could rig up something like that!