In this snapshot you can see I have selected a ship I designed and named "Analizer M3a in a previous game. I have not yet researched the tech that would allow me to design or build this ship and yet it is showing up on the list. It requires some miniaturization before enough hull space will be available (see the red bar near the bottom of the designer window which shows 100 of 94 space units used). This should not happen within a game.