You are off to a great start. You make it seem so easy, but I know better.
How about an evaporative cooling system. Build a catch pan below the engine and pump water over the engine and let it run down on the outside.
I will be following this build closely.
Isn't it amazing how much time can be consumed trying to make this wonderful, labor saving device work. Have you noticed how computers have made us paperless. Now everyone in the world has a paper consuming printer in their home. I have paper everywhere. Time to go shred more paper.