I was first introduced to this method of building liners by my fellow luthier Jeremy Clark at 52 Instruments. These liners are very flexible before they are glued to the guitar sides, and even feature a groove that will later be filled with a veneer. This procedure uses structural lamination to turn a flexible easy-to-work-with material into an extremely rigid guitar component, with great benefits for the instrument’s sound.
The fantastic jig in the pictures above was actually created by one of my students. It makes cutting the beveled edge onto the liner very easy and safe, and I will be using a jig like this from now on.