Thanks Cranston, must have been a fun visual scavenger hunt! You're pretty spot-on.
Over the years I've collected most of the SciFi based molds and a few others. I'll try to list what I have but some of these were purchased after most of those terrain pieces were made.
270, 271, 272, (273), (274), (279), 300, 301, 302, 303, 311, 320, 321, 325, 326, 327, (328), (331), (420), (424), 54, (202), (205), (206), 90, 91, 96. (Parenthesis shows ones I own now but probably didn't have at the time.)
I have a phase two of new structures cast and separated but not assembled yet. :)
Hope this helps, and really hope your project takes off, Atomic!
Dak