No kids left @ home, but with 6 cats I placed the electronics in a hall closet located directly behind the speaker wall. Prior to this I housed a SS amp behind the sliding doors of a Tansu cabinet in the living room (the cabinet is not large enough to hold my tube gear).
I would never place HIGH CURRENT gear (tube or otherwise) around kids/pets. Other than the heat (cases/cages can also get quite hot) it would take but a spilled beverage to cause injury or worse (the cats have liquid liablilities other than that of spilling drinks:-).
I'd look for another location and/or cabinet.
I picked up a nice old pie safe a year ago to hold a second spare room system. It's still in storage as I have not gotten around to cleaning out the room.
I've seen systems installed in all kinds of nice closed cabinets (wardrobes, antique bars, etc.). I almost bought an antique Victrola in a full deco cabinet once, but did not have the heart to gut it for my purpose (the dealer could not give it away @ the local flea and offered it for $75).