I have Emil’s (morgancustom) kit on my 3W. It is very well engineered and mounts solidly. He has a few videos on his web site illustrating his design.
It does not have an electric fan. It has an inline oil thermostat. I preferred this method temperature regulation as will not circulate cold oil and I did not want to run wires or switches for a cooling fan.
I also prefer the kits aesthetics to others, as they match those of Morgan’s design.