[Brainiac4]

Fingers provides much detail on this in the Modmaker's Guide to the Galaxy:

http://www.digital-eel.com/modguide/ship_example.htm


Here's a snip of the relevant part:

2. Ship

This is the easy part. Go to the terran.ini and add a new SHIP entry. Give it a name that'll be shown in game:
SHIP Assault Ship

Set its hull to the name you gave to the hull file:
HULL ter_asst

Set the flags so the ship will appear in the simulator and intro screen:
FLAG simulator intro

Then give it some equipment... Default Terran railguns, fusion engine and thruster, and an electron shield:
SYST wp_projrail
SYST wp_projrail
SYST th_fusion
SYST dr_fusion
SYST sy_shieldelmx

Finally, close the SHIP entry:
END