RE: Sig Wonder fuselage length
I put some tracing paper over the plans and drew the longer length of the fuselage. This is an example of the noble activity known as kit bashing. Our motto: "We don't need no steenking plans!"
It flew great with an OS.15LA and as 3Dfanatic says, it was a rocket when I installed an OS CVA.15. Most exciting moment was when a local hawk dove on the plane and tried to catch it as I flew down the runway.