Recently I stumbled across a site with free downloadable plans.

http://www.jetworksmodels.com

I built the 23" Ultimate biplane...WOW what a plane.

I did not put a GWS 300 on it. I put a very small GWS S1 on it. This little plane is PERFECT for indoor flying in a gym. It puts the floaters to shame. Flys slow, easy, but has full aerobatic capabilities. I was doing rolls with it my first flight in the gym here.

I cant explain it, but this thing really does fly like one of those skimmer/butterfly indoor planes, only it can do MUCH more.

There are other models available there too, including a SU-27 Flanker jet. SWEET.

Enjoy the link. I encourage you to build that 23" ultimate, you wont regret it. I couldnt believe a Ultimate would fly that docile, and slow.