The Sig Twister has become a standard.  A standard to provide the budding young (or old) sport flier into a competent stunt pilot (practice and talent helps).  Built as is, it works fine.  Add wingtips and re-shape that silly looking rudder, and you can have an airplane that will fly as good as it looks.

The wing has no leading edge taper, making it a little easier to build.  It has a 1/2" balsa leading edge, and uses no sheeting or cap strips.  It really is quite simple and easy.

Built light, a Fox .35 works well.  A more common approach is to bolt on an OS .40, or any of the current trendy .40 size engines, and you too can fly a quality stunt pattern (again, practice and talent helps).  You'll need a 4 ounce fuel tank, some 2" wheels, and some covering material.  The entire airplane can be covered with a single roll of plastic film, in less than three hours (coffee helps).  You will be left with a piece of film approximately 6 by 10 inches, which should be adequate to recover (no pun intended) from that encounter with the giant ash tree that is closer to your circle than you think.