RE: FunAero S.E.5a build
You lucky to get the Williams products now after they've stopped production. Mine were included cause I purchased it from a guy on ebay that wanted to go to a larger scale 3 years ago.
To answer the other questions. Yes, 60" wing span, 5 inch wheels, centerline wheel distance is 13 1/4 inches, axle length is 14 3/4". I think that's what you want? Or do you want C/G to wheel center? I'm eye ballin this, I'd say a little more than an 1"-1 1/2".
After approx. 6 flights...I didn't have guts enought to fly her FIRST, I had my test pilot maiden her. She kept flipping over on landing, very little damage to Rudder. The pivot point for the wheels was so close to the C/G that it was suggested that I moved the wheels ahead...try yours, it's no big deal after contruction. Also be sure to balance her...with a heavy Brass Higgins Hub Nut, I still had to add 9 ozs to the nose.