When building ships I like to optimize and modularize my ship. That being said, over the past year I've been testing and creating a collection of parts to piece together a ship. Right now there is no easy way to piece my building blocks together. I have to load a new ship, copy the block then paste it into my ship then remove the ship from play several times.
Perhaps a new file type like ".part" or ".ship.part" organized into a new default folder conveniently named "Parts". Then when building a ship there could be an option to add a part that opens up our "Parts" folder.
Another option would be the ability to drag a ship in blueprint mode which would be inferred as adding a part.