I really do enjoy designing spacecraft. Way Back When, Rick Sternbach asked me if I'd work on Star Trek: The Next Generation as a designer.
The top of the page shows 3 stages of the design of the Rosenante-class Federation special ops/incursion vessel. A step that isn't shown: the 3D paper model I did as a lark.
Below that, the "Fed Pickup" general-use ship, and a Romulan heavy shuttle.
Heavens, I must have a few hundred ship designs laying around.