BB, Having a tight frame may have problems with the width of the board expanding/contracting against the frame piece which for all intended purposes wont change length.
A good option, if the design allows for the game area panel to overlap the frame a small amount (1/8" - 1/4" is great), is to key in the frame with the expansion hidden inside. Just like a floating panel in your recent box.
Cross section looking into the board where it expands/contracts.
