Hey Ward, didn't you end up with this one of mine, many years ago? It's not a twin, but it is a bit strange. Hanriot-Biche 110, French from World War I. Model has a Fox .35 in the nose, pointing to the rear, with an extension shaft to the prop. Used a boat flywheel and boat hardware u-joints, 1/4" music wire for the extension shaft, and an old engine crankcase section for the rear shaft bearing support. Balanced right, engine seemed to cool all right while it was flying, plane pretty much did all the pattern stuff, very semi-scale. FUN!