Hey guys, my friends and I are totally fascinated of the Skram and for now we want to build two of them.  At first we'll build it with the suggestion of 18mm birch ply and after we want to do some changes for the second pair. We want to make it out of 15mm (birch ply and in the core of it one layer of poplar to make it lighter) in addition we would like to add some braces out of carbon and epoxy resin. It should be as stiff as 18mm birch ply. Do you have any concerns with this plan s