I second what Greg said above - why not use foam? I used 1.5" thick foam for my 'temporary' layout (my spouse keeps asking when does temporary end and permanent begin). Its waaaay easier to use, especially if you are assembling a table in an existing room - maneuvering in a tight space is easier and you don't risk poking a hole in a wall, dinging the woodwork, etc. I didn't glue it down (it was supposed to be temporary), but I'm sure that can be done. Its easy to cut and easy to poke holes in to run wires, etc. I'm sure you won't find it in 9 ft x 5.5 ft, but again it would be easy to piece together on top of a wood base -- any left-overs could be used to build a mountain... Because my table is actually tight to three walls in the room, it has never moved (and again, I'm not worried that the table top would damage the drywall).
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