Those sound great but from a seasonality perspective those sound more like items that I would put on my menu in fall, winter and spring. Opening a restaurant in Wilmington in the summer I would surely use all the seafood I could get my hands on (which I'm sure you know). I've worked in Florida and imo the seafood is much better in the Carolinas than it is in Florida, year round.
Again just me but iI would consider a nice escabeche or a ceviche salad/app. You would be highlighting local seafood and both would be light, cool starter dishes for the hot summer. I would definitely also consider some fresh tuna for the same reasons.
Lastly the other thing that is plentiful in North Carolina in the summer is vegetables. With all of the fresh tomatoes and other vegetables in North Carolina in the summer, (as mog said) bruschetta would be an easy, cheap and great tasting option as well.
I would try to create a niche with my menu. In Wilmington you have the tourists but you also have a local element that is a tad upscale and who know good food. Unless you are going for the fried seafood route (which honestly I considered in Beaufort) I think you need to be a touch more than the basic fried appetizer but not pretentious, at least with a couple of dishes. Simple, fresh, food, prepared and served perfectly.
30, that is all my opinion and kind of the way I look at menu planning. I'll get off of my soapbox, now. Just really would like to see a homeboy knock it out of the park in the restaurant business in Wilmington. Great area!