Wasn't too bad, the gasgets and parts are so cheap it cost only 30 euro for the whole job. Including resurfacing the head. I'm not saying a system like this cannot be done to an engine, I'm just saying look out for abnormal behaviour if you increase the cooling system capacity to 5 times the original and add extra pumps.
Old corroded parts may not be able to handle the extra pressure/heat difference. Also keep in mind that if you return the hot coolant from heat exhanger to the water pump intake, the engine will be using that hot water as the cooling water. Especially when the thermostat is only part way open, I saw engine temps of over 100C. That combined with poor pressurisation (due to leakage and loss of coolant) of the system caused coolant to boil in the cylinder water-jackets.
