Nice work, Jeff. I'm with you 100% on the Fort Wilderness RR locos. And I had the same thought about Disney royalties. There was a live steam model of the Fort Wilderness locos a couple of years back, and they designed their own logo, presumably to avoid the royalty situation.
More info here:
http://www.ironhorse129.com/Projects/Engines/Olomana/olomana.htm
More info here:
http://www.ironhorse129.com/Projects/Engines/Olomana/olomana.htm