If you want to rebuild, look at the Vivi Nova tank. It's a top coil replaceable, but the coils are really simple to rebuild. The tank is great. I'm running 2 of them on my new Provari 2.5 and they have good draw, good taste and don't leak (yet).
Phil Busardo has a real good youtube vid on how easy it is to re-do the coils yourself. I'm at work and YT is blocked, so I don't have the link. Sorry.