Help identifying a poorly treated P-bass I'm rescuing

Hello all! I bought this interesting looking fella online thinking I'd have a good project for a drop-B bass. It had a fender-shape and string-through, so that was promising. Finally got it in the mail, took it a part, and unfortunately I didn't see any serial numbers, or identifying marks on the body. Pretty sure this weird grey/blue is an amateur job. Underneath it looks like it was black or natural.

Didn't see any screw-holes near the bridge area that would fit a bridge that I know of. The only holes I saw were for this weird bridge with huge honkin brass saddles.

The neck was aftermarket. Pickups were well-worn and had no identifying marks, pots were all Mouser with a SAM HWA 24473 cap on the tone. The ground tube going from the pots housing to the bridge was super thin and came of of the screw-holes of the bridge, so that's making me think it's not fender. Also the lack of those weird random pointless 3/4" holes they drill into the body.

What is this beast? While it was still put together it sounded great, so I don't regret the purchase. Just real curious.

Any help would be much appreciated. I've tried looking blindly at images of fender bass bodies, Kramer, Peavey, and such but I can't figure it out. Thanks!

 

Just looked up the Accu-Bass, that's spot on! Thanks! Looks like they routed out the neck pocket for truss-rod adjustment of a new neck. That makes total sense now. My first Epiphone!