Not sure if anyone's brought this up before, but have you ever looked at the portal room to Grunty's Furnace Fun? In Grunty's Lair, from the CCW area you go through that note door and there's a portal that leads to Grunty's Furnace Fun. Now, on the wall of this area there are 6 (?) patterns on the wall... was this a scrapped texture or something? a beta SnS room? This might be something that was discussed a while ago, but I've never really heard anyone talk about it.
Here's a little print screen:
http://img843.imageshack.us/i/sns.png/