Half of that would be more than enough..I've seen them used on 1/3 scale cubs......now having said that, I have a G-38 stuffed in mine.
As far as scale goes, I have one of each. Neither are that close to scale and there are surprising differences between the two. With work, either kit can be bashed to be much closer to scale....
Here are a couple of examples that I have seen in my travels...
This one is a clipped wing Sig built by a friend of mine (OS 120 single)
And this one is a Balsa USA kit (OS 160 twin)
