Well, the first problem is they're heavy. The second problem with any 12-string is keeping it in tune. The first double-neck I assembled for him was an imitation of the Gibson SG double, like Jimmy Paige played.
But there is a group whose sound was dependent on a 12-string: The Byrds.
And you've doubtless heard "Hotel California," which has a solo in it on a double-neck 12/6 string. In fact, a double solo, with Joe Walsh playing, too. The intro is on the 12-string.
yes i am aware of hotel california, and the tuning problems with 12 strings,
i think i'll stick to 6 strings lol, its all stevie ray had, so its good enough for me lol.
i have never assembled a guitar from a kit, but i have stripped them and altered things, or re-painted them, i have one of mine in bits at the minute as i am "relic-ing" it, and the other i just fitted a set of fender texas special pick-ups in it, sweeeeeeeeet!