each of these questions has a thread in the appropriate forums. I'm not sure what you would want to CF aside for the hood but
weight reduction-there was a thread of a guy listing everything he removed to achieve -250lbs
brakes-the big bad brake thread
engine placement-I have no clue about seems like you would almost be better off buying a f-body and trying to convert it to a w-body :P
read safely modding your 3800 to get a round about understanding of the steps involved