Great idea. I made something similar on mine by going to my local Ace Hardware Store and buying 2 sheets of 3/4" plywood that were pre cut to 2'x2'. Then I glued them together to increase rigidity (probably overkill, but I like solid stuff). I used 8 self tapping wood screws w/ rounded heads on mine (to prevent sagging in the middle of the board over time). The screws were placed on the bottom of the board, which made my base a lot less convenient to get leveled, but once it's leveled it stays leveled.