Nice work Mark. I was thinking some of the component looked familiar. I might do as you have and do my megafuse down to 125A if yours works out. Live the way you've run it inside the car. Much better than outside.
One thing you might already know is when you crimp the 8mm rings it's (IMHO) a good idea to solder them too. I do this by poking the solder down the ring next to the cable and heating the ring socket with a blow torch. Once it's full of solder the joint Is very strong and removes the worry of the rings coming off. Obviously wrapping the ring end in tape if the aren't enclosed is good too.