Do you have more pictures yet?
Is the O&K grader 8th scale?
Someday I hope to attend one of your country's notorious rc heavy commercial exhibition shows.
You going to run your exhaust thru the stack atop the hood?
I was refering to the slim electrical fans like what's in a computer, I wouldn't think it need to be overly big, just enough to suck/blow the heat & keep the air moving within the model.