Good Post Pete!
That sums it up nicely, I would like to Add of the L420 two were ever made, they are operated by Air-tec africa and are both based in Algeria, basically the same aeroplane, except the baggae compartment has been moved to be a seperate entity and the slightly more powerful engines (27SHP more). The IELU is also slightly different in the aeries as well as the MAX ITT-
However the differences are minuscle when flying them, i preffered the 410 as the ILEU and water injection systems made more sense and were easier to identify when operational.
But i agree with Pete, easy aerie to fly, lots of fun and are a hard robust type if maintained well!
Enjoy