I actually have two concerns. I have just done ribs in my 1938 Octa. After trial and error I finally decided to steam the ribs and wait one hour then fasten them in place. This allows for a "wet rib" placement and seems to contour better. The other problem is how to get the proper contour to a multiple rib replacement. I guess we all know that replacing one or two ribs is easy since the adjacent ribs and planking sort of mold the new rib into shape with a little force. However, I had seven ribs in a row to replace, extensive planking damage, and I ending up fastening several pieces of wood to the outside in order to get the new ribs to be even. I had to put screws through several ribs thus weakening them but I saw no other way. Any advice?