I will go first. My ultimate prototype: I would get a battery company to make a custom battery to fit my new mod. My battery mod would be CNC machined out of titanium for lightness and strength. I would check out metal coatings with Tungsten because it does not scratch. With unlimited funds I would hire a team of electrical and metals experts. Slim, long and sleek. If I had the R&D money to do it. I bet there is room in the E cig market for a Ferarri of ecigs mod.