So Finally sorted the Sustainiac harmonics squeal out in my prs tremonti se.

Redone some wiring and I had to extend the 4-core cable from the sustainiac pickup because i needed it longer and that i had cut the red wire too short.
So managed to splice the 3 wires and wrapped the foil round and heatshrunk the joins.
I also cut the driver red wire and the grey wire 10pin short and again wrapped in the same foil for shielding and headshrunk also.

Finally after testing I made the cutout in the cavity cover to accept the Gotoh BB-4 battery holder.