In almost all designs the webbing is overdone. First of all, it should be vertical. It does not have to be on both sides of the spars, just have it on the back. It does not have to be continuous from rib to rib. All it has to do is supplement the ribs to prevent buckling. For example, if you are using 1/8" balsa ribs on an airfoil that is 2" thick, a 1/2" wide strip of 1/8" balsa glued next to each rib will be enough to do the job. The amount of work and weight gain will be negligable and you will be able to smirk at the poor schmucks who painstakingly do their webbing like they are building intergalactic spaceships.