Good answer, though I was working in 15 degree weather last night with circulation & arthritic problems.... to add looking at this fresh today the battery & hold down needed to be manuplited & almost be removed out of the car on it's side. It was necessary to remove the fuse block & aux + terminal to remove the washer tank located above the battery.
The + & - cables coming from the front of the car were intertwined without much play or length to the positive cable to reroute back in between the hold down clamp.
After fighting for several hours & several skinned knuckles & debating on modifying the hold down bracket by removing the loop that inserts somewhere under the airbox.. I just decided it was much easier to not re-install the the hold down clamp. The bottom battery hold down block locked the battery very sufficently like most cars are designed. (ie as on the '94-2002 Camaro) The Air Box I would imagine must be removed to properly reinstall the hold down bracket. There is also a throttle cable that is routed in the narrow gap between the battery & the air box, but I'm not even going to get into that.
The trouble with GM, is that they got 'buddy buddy' with their dealership service network to make simple maintence nearly impossible making you the consumer a captive customer to overpriced labor rates.
As a former downsized engineer I really question GM's designers on this one.