for what it's worth
I asked a full scale pilot from the club at the WACO museum site in Troy Ohio (8 miles from my house) how a bi-plane differed from flying a high or low wing. He said it is just as unstable as a full size bi-plane, has a lot of drag, reacts quickly to stick input. I have a Stearman PT 17 I was given (Stearling Kit) about 1984. I built it in year 2000. I still haven't flown it. It has ailerons only on bottom wings. It was a control line kit, so I think It will be a heavy flyer. Please take your time with the Bi-plane. I'm still all electric. I had to get used to 4 channel electric when a Pebble Creek Wisconsin Flyer let me fly his twin electric, with 4 channels. THRILLING!