I'd suggest that the Wattage Pitts is far too small for the weight of the OS26. A relaxing flyer it would not be.
The plans I had in mind for you has turned out to be either too small or too large. It was the Fred Reese design that came out as the Doppledecker for an 049 to .19 and later in a larger version as the Golden Oldie for a 40 4 stroke. Sorry, I seem to remember it being for a 25'ish engine.
HEre's a pic in any case....
