This is my second build in a Golden Age Build on HyperScales 1/72 Group Build Forum, the first being Monogram's Boeing F4B-4:
http://www.network54.com/Forum/644810/thread/1480528416/last-1480612704/(View+All+Messages+in+this+Thread)
The version I have finished mine as is included in the RS Models kit, although some scratch-built modifications are needed as described by Jim Schubert in his excellent review of the kit on Intenet Modeller:
http://www.internetmodeler.com/scalemodels/flaviation/RS-Models-1-72-Ryan-NYP-NYP-2.php
Wikipedia advises that the NYP-2 was "an exact duplicate of the Spirit of St. Louis, was built 45 days after the transatlantic flight, for the Japanese newspaper Mainichi. The NYP-2 carrying serial number 29 was registered as J-BACC and achieved a number of record-breaking flights early in 1928 before a crash ended its career." I am aware from Jim's notes that there were some subtle differences to The Spirit of St Louis, but these were relatively minor.