The looking-from-the-back-side outlet cutting kinda makes me mad, tbh. I’ve tried that and made a number of wonky looking holes that way.
Discussion
yeah ... I would try that and then find myself starting over with a brand new sheet
i'd be doing it slowly with a stanley knife... and the fastenings with an electric driver... plus he didn't put insulation between the framing, that's a definite no no
Is that exterior though? Don’t really want interior insulation for air flow and temperature evenness on the home, unless you are doing it to dampen sound or something, imo 🤔