Replacing Interior Glider Pockets?

I own a DG and the interior pockets are quickly becoming less like
pockets and more like tubes without bottoms...if you know what I mean.

So I am planning a winter project to replace these pockets. I can sew
but a few questions leap to mind;

1) What material are pockets typically made of? Anything special that
I won't find at the local sewing shop?
2) What is used at the top of the pocket to make it stretchy.
3) The pocket is attached to a long piece of matching material along
the interior. I assume that this long piece has some stiff material
inside to give it rigidity. What is it?
4) I assume that the old pocket is glued to the wall of the glider.
Any tricks in removing this?
5) What do I use to attach the new pocket to the wall of the glider?

Thanks in advance for your suggestions. As always I will photograph
my results and put them on my web site. http://aviation.derosaweb.net.

- John DeRosa