Hi Tony thanks for the positive note make me feel better. Don and I are not reslly getting along right now. TONY I ve been following your post and watched your cowl mod. That would work with my OS 300. That engine I bought especially for my 1/3rd Champ build. Been planning on this for years. I've sent an email to Probuilders all the post on the partsI need are at least 10 years old except for yours. Got lots of good Ideas from several posts. Looks like I may start the wing ribs when and if I can get into touch with ProBuilder. IVE Spend a lot of money on this only to see very little results. Am very disappointed about all these developments concerning my build. Hard to.explain all this. But I have enjoyed all the reading. AJ.