So the person who made Gboy (Grable-boy) is my Grandfather. He makes them all by hand and I'm not sure how many he made. but he is almost 90 years old now. He still hand makes them every once in a while for family gifts. His name is Gene Grable, him and his wife live in California. They are amazing beautiful people who i admire and strive to be like. Grandpa is almost 90 and still works harder than 99% of humans. Always creating and inventing.
As far as anything about the bikes I do not know, maybe email for questions or something and see if I cant get you the answer. Anything I can do to help. Thanks :)