Dude I am not hating on you! Listen to me keep your grounding on the outside. Ground to the meter box or the ground rod that is NEC rules. If that House gets hit and your ground wire was the source that brought it inside the fire inspector and insurance inspector can point out that you were wrong because of NEC code. Don't underestimate the knowlege of an inspector.
This is CABL.com posting #211510. Tiny Link: cabl.co/m3bC