I purchased a Pitts S-1s last February, which has sparcraft wings. I just completed an annual condition inspection helping out my local shop. I really wasn't able to see well enough to see the details of the wings. I had previously built an S-1c back in 1969, so I am familiar with the built up rib wings, but I have never seen a sparcraft wing uncovered. If anyone has any information concerning the wings, please let me know. I bought the Pitts to have something to fly while I build my Skybolt, which I just started.