The Skyshark has been used as a .15. Lighter is always good. You will have to be careful about the CG. The design was made for heavier engines than a .15. I think it would be fun.

The Skyshark was a totally useless product for any past or present carrier event. 
It simply didn't come close to fitting any AMA event or any local event that was ever devised. 
Sure you could put a 15 on it and enter a contest. 
Let us know how it works.
Carrier contests are won by MO-1's and A FEW other designs for a reason.

In defense of the Sterling Skyshark (a bit off topic):

1) I flew a Skyshark powered by an ST G21-40 at Olathe in 1968, placing 3rd in Sr Class 1. Maybe it wasn't a record breaking performance but I had a great time and brought home a NATS award. It's an excellent flying airplane.

2) The particular design for the landing gear is bullet proof. The design manages a wing mounted gear that transfers all of the landing loads into the fuselage. It works.

Paul , appreciate the honesty and your opinion , I know the mo-1 , sniper, and a few others are the winning combinations. However , my personal preference is that a carrier plane should look like an actual plane not like a stick with a wing mounted to it. I really admire those who are brave enough to build and fly carrier based bi-planes . The most impressive plane I've ever seen fly was when Bob Reeves flew his jet at Brodak's , the craftsmanship and work that went into that plane is way beyond my ability
 Eric , if it would help your build , I could have the plan copied and send it to you.
I recently got my cd from Tom Wilks and there are a couple possibilities on it also.
Right now it has been too hot and humid to build anything in my shop , so I've been cleaning it up and waiting for cooler weather. I'm just trying to figure out what .15 plane or planes to build and which class profile to build. Like the idea of profile but leery of all the controls needed , so I'm leaning toward sportsman class ( ease of construction )

     I see your point Bob, that is quite a center section. It helps a little that the gear is a little narrow but on the whole its a pretty clever setup. The F7F has a very wide stance on it main gear and then it has a mid to high wing location that makes a lot of leverage problems. I'm trying to put together an electric AMA profile twin and they are always a problem but its just for fun (I keep telling myself) and don't expect it to be competitive.
     Ken, thank you for the offer but you don't need to send me any plans, Bob pictures tell me all that I need to know. I'm kind of the opposite from you (and a lot of other carrier flyer's) in that with me its flying performance first and looks second.