I spent a couple of days at the Northern Lights/Lugger factory in Seattle and would have to agree with Ski about the blue printing. The pile of parts they take off the engines is very impressive, especially when you compare them to the size,thickness and heftiness of the parts they put back on, but they are not blue printing the engines. Most of the parts used are the "best they can buy", but not all and they de-rate the engines quite a bit for long life.
A few examples of the parts that are not exactly "best of breed" would be the Jabsco raw water pumps (used because the parts are so readily available world wide) and the three Bosch automotive relays used in the start/run circuits (good relays, but also used because replacements are easily available at almost any auto parts store and they are easily swapped around - you don't need all 3 to run).
YMMV,