Hey John,
What is the heat sink for?
The power fets need to be on separate heat sinks, but they sure do not need a heat sink that big!
More like this is plenty,
http://ghurd.info/images/DC/heat_sinks.jpg
If they are not on separate heat sinks, the loads are all connected together through the heat sink, and it will make the fets less reliable.
The fan could be connected to another fet, but it will most likely only twitch most of the time.
The dump load ammeter will mostly swing wild full scale, and very wildly.
It'll be about as smooth as a Red Squirrel after a gallon of StarBuck's espresso.
Each resistor will dump about 1.44A, so it's either 0A or 17A, and fast as a ticker tape machine.
G-