tph1: If you mean the fuse formers, I purchased those, which were laser cut, from Gerald Williams. I don't think they are available any more. Gerald, unfortunately, seems to have disappeared. The ribs were cut as newbieT describes above. It probably was not worth the cost to buy the formers as the method newbieT describes works so well.

He and I are building a T2K and a Tempest respectively (pretty much the same fuse) and used the the laser cut former sheets, which I saved, as paterns for the fuse formers and the cut-and-paste method for the ribs. Be sure to go light on the contact cement or the paper is difficult to remove.

Dave