When Rick Sternbach took over Probert's duties, he believed the sketch was a rejected concept for the "Enterprise"-D, but the ship's design stayed with him. When he learned about the ship requirement for "Yesterday's Enterprise", he followed a thought process similar to Probert and built off the old sketch. Probert's version had a highly curved engineering hull reminiscent of a sailing ship, but Sternbach was worried that a design with so many compound curves would prove difficult to fabricate in the available time, so he made the hull entirely circular. A set of orthographic views was created and sent to Greg Jein, who fabricated the shooting model, which cost more than $10,000 to produce. The model was modified to appear as various "Ambassador"-class starships in later "Next Generation" episodes, with its saucer and nacelles spaced apart to create a larger ship.