I am new to this site, and have a 1948 B12 that I am begining to restore.  The outer plywood needs to be replaced.  I have started to research birch plywood and am thinking of going with rotary cut Baltic birch 1/4".  Would this be a good choice?  Any information would be appreciated.   Also, the frame work is broken above the windshield by the front doors - I understand this was a weak spot.  Any reccomendations on how to best repair this?