Legacy HSS that was outfitted with a preamp like my S•500E..

From a post on the CLF Research's facebook page:

Checking in with the big boss, a Legacy HSS that was outfitted with a preamp like my S•500 E project.
I mentioned before that a couple of alder bodies were accidentally run with a vintage CLFR battery pocket
so now I get to experience another “what if” configuration. The mini-toggle controls the preamp and the coil-split is on a push/pull