The other preamp is some kind of onboard distortion/booster thing.
I did unfortunately find nothing about the original B.C. Rich one in the Internet.
So i take some old Jackson onboard Booster for it maybe.
Here are some Vero Layouts which are not my property.
I'll try to contact the guy who makes them several times to ask for his permission.
He did not answer to the present day.
The Layouts are public...so i guess they are free to use.
They are still not verified.
So can someone have a overlook on them and maybe verofy them.
JE 1000: