I use PS CS2 and the main thing about new skins is keeping the details(ie rivets etc). I don't know much about Coral but you need to work in layers and set the layer state to overlay. That way you keep the underlying details. In your pictures above you can't make out the decking detail etc.
I have a tutorial link which may help you out, but it is based on Photoshop....
http://www.subsim.com/radioroom/show...light=SKINNING
BTW I'm willing to do some of the skins for you if you want.
I was going to make my Bernards Daisy boat pink, but thought that it would be stepping on you toes.