8x42=336 watts that will be a 336 watt rubber maid tote.
minus the cubic feet of space a "decent grow" uses this is going to be a fire hazard. You may have access to a giant tote
but that is not going to work.
8 42w cfls will get very hot, trust me 4 -42w cfls will get very hot, just because they are cfls doesnt mean they wont make your box hot, what kind of exhaust do you have