A couple of pictures of the old box.

After cutting it out I found strips of soft packing like foam most likely for expansion or for ????

You can see were they sandwich some carbon between the foam to make a stringer.

Old box cut in half.

Side view of box cut in half you can see the wood shims a a whole lot of filler.

This box was very heavy I see why the green boards where so heavy.

I removed it to install a ture deep tuttle box so I can use other foils.

I'll add more pictures as I go...