I've actually made a little collection of both main types of piston ships (except multidirectional)

These are all free to copy for any purpose, no credit needed.

(I tried to upload a GIF of them, but it wouldn't let me)

You can get them at this save:

There are 3 types:

     Sausage ships - they can be any speed, but they can't carry much

     Block ship - it can carry a lot, but it's really slow

     Double sausage ships - I'll be adding as many speeds as the single sausage ships

     They can go twice as fast as a regular ship, and carry more, but they're still a work in progress.

If you have any other designs I've missed, please tell me, I'll try to adapt them.

Comments, suggestions and feedback are welcome!