Looks good! I am wondering about the service panel on the outside. No basement? I also would use pvc to protect the gec. I would not use the mini's for clips mainly to prevent future unsightly rust issues! If the inspector has a problem with this one perhaps there is an old safe hidden in the building that might "accidently" fall off the roof! Always works in cartoons. Wait just thought of something. How many ground rods are installed ? Are they (it) below finished grade? The 15 amp receptacle is fine on a twenty amp breaker as it is NOT a single receptacle as defined by the NEC, it is a "multiple receptacle".
