That one looks good except for the lack of an IR panel.
...http://www.boxenclosures.com/category/product_details.html?product__id=177464 looks best (lack of IR panel aside for the moment). But it says the cutout is for a 2x16 display at 1.79x0.7 inches. That seems to be much smaller than any 2x16 display I've seen, and might be a decent fit (but a bit short) for the 2x8 seeedstudio display.
I think I need to learn to make neat holes in thin plastic!