Think about having Pete Hilton build you one. He has been working for/with Carl for years and his build style is very similar if not identical
This old and not for sale, but gives you an idea:
http://www.talkbass.com/forum/f126/fs-pete-hilton-5-carl-thompsons-top-builder-786502/
This old and not for sale, but gives you an idea:
http://www.talkbass.com/forum/f126/fs-pete-hilton-5-carl-thompsons-top-builder-786502/