If you want a twin there are a bunch to choose from. Just have to find the right drawings.
Bamboo bomber, Piper Apache, C-310, Twin Beech. Then there are the twin airliners, DC-3 up to the Dash-8.
For singles the Beech 35, Bellanca Viking, Mooneys, heck, even Cessnas.
For a real challenge do a Cessna Mixmaster
There was a Staggerwing done in here (nfhill if I remember right). I enlarged a set of his plans but haven't done anything with them yet. Don't remember what span, 54" maybe.