Thank you Simon, I have found veneer. The company gives away free A4 size samples and they sent me enough to do ten concertinas.
Now, I have never worked with veneer. Can anybody please give some instructions how to do it the correct way? How do I get the holes for the buttons and sound holes? Should I first mark the holes with a pencil and then punch it out, and then glue the sheet to the ends, and when it is dry, finish it off with a dremel? Will PVA glue be ok?
Thank you for your help