I was just looking thru my server room and extras and I think I actually have 2 rack mounted enclosures that were made for putting XT mother boards in them that may just work haha...
Actually that might work, gut it and you might have something there...
I presently have 3 S1's stacked and tied on top of each other and some others sitting on the floor at the bottom of some racks. They are all sitting at 41-42C so I guess I shouldnt even need to care about keeping things cool if I have s1's running that cool and overclocked. I have S3's sitting out in the office area and they are at 42-43 and super quiet where and S1 out here would be at 46-47 fans blazing. So it just seemed to me those enclosures were really helping keep the s3's cooler.
I will certainly agree with you there, the S3's are for sure quieter and it seems a little cooler. Honestly it seems the open S1 frame is cool, but heat just flows everywhere out of it. With the covering on the S3 it tunnels it better through the boards and out the back, at least better directing the airflow.