EV Edit really sucks. For Escape Velocity and Override plugins, I would suggest just using the templates and the bible. The only good thing that I remember about EV Edit was the graphical syst resource editor. After that, I don't suggest using it.
As for your bay, you need to remember to click on the "Use Second Trigger" (or whatever it may be) box. As for the <quote>"It uses the ship's sprites for another weapon. I don't know how to get it to work." </quote> Did you remember to set the weapon as a bay, and then set the ammo type as that of the ship that it launches? I don't think that you need a graphic value, but inaccuracy can have a neat effect (the Manta launch).
Hope this helps.
Matrix.
------------------
Captain: What happen?
Mechanic: Someone set up us the bomb!
Operator: We get signal.
Captain: What!