So here is the 2nd incarnation, judging by the dates it was a long time coming but I was just too lazy to post for a while. Made one for me and one for Lutz in Hamburg. The construction is four sheets of 3.3mm Baltic Birch.
Size is 39"x10"
WB 29" - 31.25"
0.5" of progressive concave.
Will make a few more this Spring. 2mm and 3mm Birch constructions available. Stay tuned!