I recently acquired this Aria SB-1000 with several mods. It left the factory as a fretless with just the middle one of its current three pickups (original Aria pickups identical to the middle one), the jack on the front and active electronics. It is currently running passive, with a different varitone (the stock one was included though) and a balance pot where the jack used to be, and the middle pickup should be activated with the switch but currently doesn't work.
I'm not looking to restore it into its former glory, but I would like to make a fully functioning instrument out of it again, maybe with the classic SB-1000 circuit back in place running the middle pickup, and with two modern sounding pickups in the outer positions to add versatility. I'm looking for suggestions, and wondering if any drop-in replacements exist. Shoot!