Wood Working for Wargamers: Hmmm I wonder what this is? Post 8

What could this become?  It's 48inches long by 30 inches wide and will be a huge efficiency gainer for me.  For the few of you in the world that cling to that dubious metric system that equates to 122 cm's long by 76.2 cm's wide

Any guesses?

and no, it's not a really badly made picture frame.