You might try contacting these people. I just visited this museum where the Spruce Goose now lives. What a museum!!! There is an R/C flying site right on the grounds. I was speaking to one of the volunteer docents (also an r/c pilot) and he said they are building another model of the Goose right now. He mentioned the plans that were in MA a few years ago and said they were nowhere near scale.
http://www.sprucegoose.org/
Regards,
Astrohog