Jeff is spot on in everything he mentions. The engine mounting and cowl carving would be much easier with a small case like an OS 55. That would also save tail weight ( 4 ounces or so in my case). I have an OS 55 and removed my 61 FSR just to check and it would balance nicely without the tail weight with the lighter motor. Read all of Dave's revisions, they saved me a ton of time and helped make the airframe more precise. Pay particular attention to his incidence notes and the notation that the plans show one side of the stabilizer longer than the other. He has done us a great service by taking the time to make these notes!

Chuck