Yes, if you're creating a plug that only modifies existing ships and nothing else, that is the case -- balances will be thrown off.
Now I haven't used EV-Edit in ages, but I believe if you have graphics in PICT format on your hard drive (in the same style -- 6x6 tiles, each tile preferably a square with size a multiple of 8 pixels, having both a sprite and a mask), you can import them.
If you have further questions, or you don't understand, I might have to go and grab EV-Edit again and investigate. I actually prefer editing resources directly in ResEdit -- in that case you would just copy your sprites into your file and make a spďn resource that corresponds to your shďp resource.
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Mike Lee (Firebird)
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