FILMATION animation studio APPRECIATION

[Güicho]

It does list artists for each episode and does go into a some—not great—detail about the other vehicles like the aquashuttle

Was filmation using notes and visual concepts established ( but (maybe because of cost?) never produced) from TOS, or did they just make their own stuff up? Cause the design work, new ship concepts etc. what they came up with really seemed to fit the visual narrative of ST TOS.
Not sure who designed ships?
While other (more modern) shows, that are supposed to reflect the era, just seem to betray it.