Help, Biplane wing
Can't help you on your specific request, however, if you go to POWERAEROBATICS.com you'll see the Challenger ll which is a modified Christian Eagle.
Complete plans are available for this aircraft in the Gas sizes. There is a smaller one but the popular one is the 120cc powered 90" version. The source does not have a web site but sells both kits and plans. The full scale and the model flight characteristics of the Challenger ll are very, very good!
If you check this out and are interested in the design I'll get you the stateside address, phone # and email. Let me know.