Wait 'till AEBG. We will put the wonderful in experience.
Nice work! Jeff is doing a workshop in Madison, Wisconsin, in July. Sponsored by the Wisconsin Veterans Museum and hosted by the UW. See Jeff's website for more info and to register, or call me at that Museum 608-266-1009.
I got my gourds on Ebay. You can look for martin/birdhouse gourds, or canteen gourds. I would suggest contacting the sellers who sell large numbers of gourds, and tell them what you are interested in. My martin gourds have very thick walls, and are really hard. Does anyone else know what gourd varieties work well?
I should add here after the fact that I built the banjo from scratch after buying the gourd, walnut for a neck, and a banjo head from Elderly Instruments
I can't find any suitable gourds in the UKCheck out flatfootjohnny (via google) he is in England and making great-looking gourd banjos.