I have the Wildcat myself and even with the stock motor and stock prop that ESC gets quite hot. So with that motor it is almost sure to over heat. BTW I run 3s 2200mah Gens Ace 30C packs and with the stock setup they get warm (not hot) and I net about 5-6 min. run time.
That motor pulls about 40Amps on stock SC10 on 2S I believe. Considering the boat is direct drive and if you use the stock prop you would hit in the 70-80amp range i would bet. This is fine if you can keep that motor cool enough. The ESC will not be up to the task though.
I am curious to see how this works out.
Nice job on the rebuild and custom work. It looks good.