I am getting my hands on a few different mods with internal batteries. All regulated with some kind of board or another. Would it be pretty straight forward to update these to use with a 18650/2x700 battery sled? I realize a new enclosure would have to be built, and that would be the fun part. I was thinking some kind of coil tester that could double as a DripStation with an RDA for taste tests/reviews. Anyone done something like this before with any advice?