Rear corner lower repair

I've always known there are a few mysteries hiding in the rear corners of my bus so armed with a grinder rather than an archeologists' trowel I fought my way through the layers of ancient filler to unearth all the rust demons hidden beneath.

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I wasn't too surprised with the left side- a few small holes around the shelf line and plenty of dents under all that filler but the right side revealed this maze of holes on the inner corner of the deck lid seal line and covered by a channel section on the inner skin. This could be a little tricky to fabricate a patch for. But I like a challenge...Not