tp76 you are a pioneer and my inspiration for my attempt at modding my case. I took a slightly different approach but have the same results. Wasn't very comforable with the amount of plastic that your design had to take out of the Otterbox (especially around the HDMI and Micro USB flap). I took the standard battery cover and cut out a hole to fit the phone with the Extended battery installed. If I every change my mind I can buy another standard battery cover from Verizon for $5. Then took the Otterbox case and cut a tapered hole for the extended battery. Tappered so that the battery is held in place with the Otterbox case. I think it came out quite well and I'm pleased with the results. No mod of the rubber case was needed.