Concrete Grill and Counter

Getting ready to build this adjacent to my patio, all concrete. Question is whether to go with a 2" thick wall or 3"…1/2" welded rebar set in 48" deep pilings will be the backbone.

http://i31.photobucket.com/albums/c353/Lukemages/grillassembly1.jpg
http://i31.photobucket.com/albums/c353/Lukemages/grillassemblyback3.jpg
http://i31.photobucket.com/albums/c353/Lukemages/grillcabinet.jpg

sweet
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