Thanks for this link Gap, there's a ton of useful info in this thread. I'm browsing through it and tweaking some values in my ship's files to get rid of the lighting problems and other bugs. I have to edit the .zon files as well since these still weren't changed from original ship.
I probably will have to make my own ASW weapons for it as well. Even if I could get SH3 or SH4 Y-gun to work (SH5 works, but is rendered black on dat model), they have far too much ammo for this kind of ship. And no DC chute that would fit for stern depth charges is in game files.
Meanwhile, some shots of the current version in game:
