I designed the U.S.S. Titan sorta like Voyager, one complete ship.
Pocket did not mention if she could seperate or not.
When I started to redesign her into the I.S.S. Titan, I decided to try
the saucer sep look and liked it. I also came across a sketch of what
the Ent-E was supposed to look like saucer-seped and used it as a
basis for the I.S.S. Titan's seperation