yanmar hopper engine

[Dualfuel]

The engine came out of a boat. It has a water pump that circulates lake water through an exchanger, and dumps it into the exhaust. I gotta replumb that for land use. I would like to try a gas/liquid heat exchanger for the exhaust and run coolant through the lake water exchanger...prolly have to go with a bucket at first.
I am attempting a pic.
DF