January 31, 1977 Original Concept
After I laid everything out on common brown table paper (with a hand drawn grid), it suddenly dawned on me the direction this level would take, and more importantly what role it would play in my growing campaign. Like my original Isolde-Delta map, this level went through so many changes I had to continually redraw on new paper. Thus, Level 10 was the first level I originally laid out, but didn't really have a fully fleshed out idea of what, or rather who would live there till about six months later.
I envisioned a burrow of sorts with beetles, lots of beetles and two rather large set pieces around a central theme. Scarab's Heart finishes off The Castle of the Bloated One's Main dungeon complex.
Edit: The original I uploaded had a hidden burrows and shadow layer on the Sun Temple.