You're welcome: I am very happy to be part of this community.
Now, I don't know if this thing I'm going to write should need its own right topic, but I start to write it here.
After reading the interview I contacted Larry Brooks, and I asked him a confirmation about the Mustang wiring on the original two Jagstangs prototypes. He very kindly answered (and sent an image of the mustang diagram too, because my Jagstang was really in bad shape when I bought it on ebay).
"I hope this helps...but as far as the Curt’s guitar..he already owned a Mustang and wanted the wiring to be just the same because he was so familiar with switching already".
I asked him if I could share this information with you guys in this forum and he gave me his authorization, and so I'm doing now.