I built my PBY from the RCM plan, you can see the model at different stage of construction at :

http://pages.infinit.net/heliweb/pby.htm

This is not an easy to build project, there is a lots of parts to carve from balsa blocks moreover, the fuselage is sheeted from 1/64 plywood then covered with monokote, this is a challenging task, but the end result worth the effort, by the way, this is not a true scale model.

Dominic