Im a little bit confused, the glass is glued onto the wood between two 1x4s. They wont be moving im pretty sure, and also, though you cant see it, they are ever so slightly spaced apart, maybe about 1 or 2 mm's. Im pretty sure no rubbing together will occur, unless the whole thing warps and ill be building this sucker strong and putting a good bit of sealer on it so I wont have to worry about water damage.
Also, what color does everyone thing it should be? I can either do a light Oak stain, or stain it black so its a solor color but you can still see the wood pattern.