Don't worry about removing the material from the ribs. The pieces that build it back up are ply and are much stronger in the end than a small piece of rib that was removed. It was designed this way. As far as the sheer webbing, no sweat there either. Adding sheer webbing to the outboard rib bays are just merely adding weight and add no beneficial strength. The ply spar along with the 4 sheer webs per wing halve give plenty of strength. Keep up the good work !