Realized I cut the hinge slots in the wrong place on for the outboard hinges on the back of the rear stabilizer. After panicking and wondering if I would have to replace the rear spar and doublers, plus all of the gussets, I took a deep breath and contacted an EAA tech counselor. We talked through my proposed repair approach and he agreed--said the rear spar would actually be stronger than the original plans. So, I cut two biscuits and expoxied them into the slots. Then, I cut 1.5mm gussets to extend 2 inches past the ends of each of the hinge slots on both sides of the spar. Disaster averted! Thanks Jerry for the quick call, much appreciated.