Crossbeam construction

Crossbeams are at last under construction. This part of the building process has hardly any difficulties except for the fact that the ply crossbeam web consists of nine pieces on which fourteen hardwood pieces must be glued (more if they are scarf joined). As a result every crossbeam involves a serious amount of work and demands a serious amount of clamps! Fortunately, in the carpenter's workshop that I am assembling the crossbeams, clamps are not a problem! 

In the photos bellow the plywood web is seen, as well as the first croosbeam taking shape with the first hardwood parts glued on. A 6m long iron bar is bolted on the bench in order to keep everything straight until the assembly is over (cost 15 €). 

I had some doubts about the strength of the crossbeams, considering the loads they will be carrying, but even the three first pieces of hardwood gave the ply web enough stiffness to resolve all my ambiguities!