This may be fixed in 2.0, but I just got a crash with this error:
09/18/2018 19:17:49 | System.IO.FileNotFoundException: Could not find file '[user's home folder]\Documents\My Games\Cosmoteer\Mods\roboteche_zentraedi.0.1.21\Ships\Zentraedi Type Picket Ship.png'.
09/18/2018 19:17:49 | File name: '[user's home folder]\Documents\My Games\Cosmoteer\Mods\roboteche_zentraedi.0.1.21\Ships\Zentraedi Type Picket Ship.png'
I checked the directory, and indeed, Zentraedi Type Picket Ship.png is not there, there is a Zentraedi Type Picket Ship.ship PNG file, though. If I run into it again, I'm just going to make copies of all the ships and rename them without the .ship suffix just in case there are other functions that call the .ship variants