I would avoid this for two reasons. I know Mags are listed for external, but I don't have total confidence in that (love them for in sump though). I don't like that U idea for a mag. Also I wouldn't worry at all about heat. I have 2 Mag 18's on my 125gal and temps are never a problem (with MH lights too).
Getting the tank drilled should be pretty easy. I just got a 29 drilled for the new fuge on my 125. Posted on the FMAS RC board and they were quick to help. Someone here should be able to do it. If not, SITC or Oviedo Glass are two options.
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"Why is the rum always gone?"
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