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Oh! And I wouldn't rule out xenomorphs as a Mythos monster. After all, they are based on a design from Giger's Necronomicon book. Maybe there's an immortal Empress somewhere, a true deity in herself, and the xenomorphs are her thousand young. Or maybe they are bio-weapon engineered by some alien civilization for a cosmic war.
I just wanted to let people know that Strange Aeons Sci-fi is brewing slowing in dark basements around Uncle Mike's Lab.
I would also review the weapon layouts in X-Com as a baseline. I feel Strange Aeons is very similar with regards to the layout of the core game- I would keep to a Gun/Armor/Item1/Item2* format. In Scifi it's very tempting to become weighed down with equipment options but I think you will find that the inventory will "right size" with time.