Awesome looking bow Max! This gives me hope because I'm currently working on a maple board with the same exact dimensions you mention here with extremely straight grain. Another one identical to it (actually it was a 12' board I cut into two 6' boards) and I have 1 or 2 redoak boards with the same dimensions. The one maple I've already cut to those pyramid dimensions and linen backed. Sorry to hijack, just wanted to say I love the looks of that. Bet it's nice to shoot.
Barry