"There she is..."
I think one of Matt Jefferies' design concepts for the Enterprise, just after the spherical hull version (now known as the USS Horizon), was pretty much the final model but upside down.
That would be this one.
I think this one is definitely the design inspiration for the USS Reliant
in ST II which then gave birth to the design of the USS Grissom
which, IMHO, is the evolutionary link between Enterprise
(unfortunately nobody wants to listen to this theory, mind read my 9 page theory treatise...
Just last week I read the anecdote Albertese was quoting. I think it was from the Star Trek Sketchbook.