The Enterprise XCV-330 was depicted in an old-style painting on the Rec Deck of the newly refit USS Enterprise NCC-1702 in 1979's Star Trek the Motion Picture. Commander Decker is showing the Ilia probe around the ship in hopes of causing her memory engrams to surface and shows her a series of paintings in an alcove on the Recreation Deck. These depict the 19th century USN frigate USS Enterprise, the WWII USS Enterprise CV-6, the Shuttle Orbiter Enterprise OV-101, the ringship Enterprise XCV-330 and the pre-refit USS Enterprise NCC-1701.
The ringship was based on a set of 1970's preproduction sketches by Walter "Matt" Jefferies for a proposed series by Gene Roddenberry (probably Starship, later resurrected as Gene Roddenberry's Andromeda).An illustrator on the Motion Picture, did this painting based loosely on Jefferies' sketches, at Gene Roddenberrys' suggestion. More information can be had at Trek Place's article "Spaceship of the Rings". There has been much confusion about these sketches, causing many commentators to suggest that this was an early sketch series for the USS Enterprise from TOS, including the writers of the Star Trek Sketchbook, although they mistakenly include sketches for the Star Trek Phase 2 refit as early sketches for TOS even though they're clearly dated '77, so this book must be taken with a small Siberian salt mine.
Rick Sternbach illustrated Stan and Fred Goldstein's Star Trek Spaceflight Chronology (Pocket Books, 1980, ISBN 0-671-79089-7), in which he did a new painting of the ringship, dubbing it the Declaration class Starliner, a 300m long passenger ship with a crew of 200 and a passenger manifest of 900. Many fans, probable because of the confusion about the Matt Jefferies design, reject this concept. The Jefferies sketches show a ship some 417 feet (a mere 127 metres) in length with a radically different forward module (a tubular forward module with a large hump at the aft end, a large sphere at the forward end, a tubular structures on each side, and four smaller spheres clustered about the central hull). Based on this evidence, we must conclude that the Jefferies Starship design and the Declaration class Enterprise are completely different ships. It is possible to fit the Jefferies ship into Trek chronology, but as a prototype ship testing Alcubierre warp drive designs. These designs are reminiscent of Vulcan warp drive designs. Although ther Declaration writeup established that there was an Enterprise in this class, it is not the Enterprise in the Rec Room painting, as that was a smaller ship with a different bow structure. Rather, the Declaration class was based on the basic shape and using the warp dynamic test results but is otherwise an unrelated vessel.
At a length of 300 metres (984') with a deck to ceiling height of 2.5 metres (8'2.4") and deck to deck being 3 metres (9'10.08"), the ship is actually quite large, having sixteen decks. Some of them are awkwardly shaped, but can be used for storage, maintenance and equipment spaces or for lifeboats. The three deck high "neck" between the Engineering section and the forward Passenger decks has two decks of lifeboats and a lower deck with liquid storage. Lifeboats are also stationed on Deck Seven. Access between decks is via a turbolift system. The portside tubular section houses a swimming pool and an arbouretum, while the starboard one houses luxury cabins. There are five classes of cabin, each capable of housing two passengers. Class A cabins have a double fold-out bed/sofa. Class B cabins have twin beds and are slightly smaller. Class C cabins are with four beds and Class D (or Steerage" cabins are smaller with two sets of bunk beds. Suites are twice the size of Class B/C cabins, have a bedroom with a king-size bed and a parlour. Class A through D have "efficiency" style freshers, while Suites have standard style bathrooms with showers.The ship carries 250 seven-place lifeboats, well over the number required.