Transom Replacement?

[BassMaster_17]

I am thinking the Transom in my Skeeter is gonna need a overhaul SOON, i noticed some flex in it. The boat had some leakage problems in the past and the past owner figured it was easier to turn on the bilge on each outing rather than finding the leaks and fixing them. The question i have is how far from side to side does the transom need to be replaced on the cut out bass boats, just under the motor cut out & splash guard or does it go the full width of the boat? Tapping on the transom it seems SUPER SOLID (a nice solid sound) outside of the cutout but under the cut out it sounds alot different and softer.

I am gonna use that SeaCast pour in fiberglass rather than more wood that can ROT!!! If its just under the cutout and spash gaurd (correct me if i am WRONG) but i believe i need to take the motor off, take the aluminum transom cap off, cut the fiberglass off the top of the Transom to expose the wood, drill, chip & remove rotten wood then Pour in Seacast, Refiberglass the Transom top, Replace aluminum cap and remount motor correct? While i am at it i think i will alumimum plate the inside of the transom and put a Heaver longer aluminum transom cap on the boat b4 rehanging the motor. Any thoughts, hints, tips etc, are welcome And needed.....LOL

Thanx in advance
KW