Go with the plywood sealer, liquid nails, and epoxy grout. It's faster, easier, and lighter. I have laid quite a bit of tile on concrete and wood with backer board. I have also built and tiled tables with plywood sub base and glued the tiles on and used epoxy grout. It's not worth the extra trouble and weight to do it "conventionally". Just my $.02 - Dwain
True... it's not all that heavy. Just googled it and it says 1.9 lbs per square foot. I imagine you're lookin' at 8-10ft^2, so that's another 16-20 lbs... But it also means that much more mortar.
Up to you, though. My keezer looks about the same size as yours and I used granite... it's pretty heavy, but not really all that bad to lift with a hinge.
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