I started a game as the humans, and decided my constructors were too slow. I upgraded the design with two Ion Drives, called it Constructor II and wrote in the description box somethng like "Twin Ion Drive enhancment". I started uilding those instead.
I started another game with a custom race. I went to the starport screen and I saw my Constructor II design on the build list and the basic template constructor was no-where to be seen. It appears that by upgrading the design I have replaced the basic constructor template with my own. That doesn't seem right, surely a new game should go back to default designs?