Hmmm, nope. Cloned the tender, changed the name in the .dat file and .cfg, didn't show up in the roster. Roster. Duh.

Looked in the roster folder, copied the SubTender.cfg, renamed that and the ship type to SubTender1.
That got some action, launch the ME and get error message, "The unit class SubTender1 from country American not found in the platforms library."
Okay, I'll bite, what and where is the "platforms library"?