Your sentence is confusingly worded. Are you or aren't you saying the image in question is possibly a copy of actual Art Department material?
Here is my original post # 217
in which I addressed the issue, assuming
transwarp schematic from that fanzine to be genuine ST Art Department stuff.
But after the TOS shuttlebay VFX model experience (
) I decided to pull Johnson's Enterprise-A
tech manual for a comparison and then realized that the E-D had been just placed over the E-A transwarp schematic from the TM (with the exact same frame text and technobabble numbers).
Theoretically it could have been a draft
for a TNG okudagram but I think this to be very unlikely unless I see an actual TNG okudagram in similar style. I will try to scan a page from that fanzine later to illustrate the issue.