OWCH! those things are HOT! What do you plan to do about the heat!
in a word: convection. Many of those cases have top vents or ports, so a clear plexiglass guide behind the lava fixture's heat source will direct it up towards the top of the case, then out.
I'm also going to (try to) engineer a tube system to blow a directed stream of air directly onto the G4 chip so I can keep it pretty and not have to put a heat sink on it. :-D
