I considered that, but Will has been there a while and I don't recall any interesting aromas... and wouldn't it make a great spot for the grill?I think the spot with the sewer cover is a low spot, so if it rains hard it turns into a river, just a heads-up. And keep in mind it IS a SEWER cover, and NOT air tight.
Also, I wouldn't wait until the last minute on that tank unit, just in case there are any issues with it. My brother has bought several reproductions, and has had issues with a LOT, if not all, of them. I don't know where he got them.
SEE YOU THERE!