8 String Yamaha F-325?

Somebody tried to add an extra two strings to this Yamaha

Picked up this weird Yamaha for $20. The frets were pulled out pretty cleanly (even preserving the fret slot fillers on all but one) and there is no evidence of an attempt to add two more tuners, just a nut that had been slotted with an extra two holes.

Plugs filled and bridge oiled

I filled the holes first with an oak dowel to act as a stopper and then piled on rosewood dust and super glue until it entirely covered the hole. Then I took a large bastard file and shaved my filler down till it was level with the bridge and finally ran sanding from grits 220 to 2000 to polish the bridge and make the plugs look nearly invisible

On a sub-$100 guitar like this, it isn't worth taking the bridge off and making a new one. There was nothing wrong with the bridge minus this repair and a splintering bridge plate which I glued a piece of African Blackwood onto to help support the ends of the strings.

Who knows what this was supposed to be

Update:

After attempting and failing to remove the fretboard (I believe it was epoxied on), I put the truss rod nut back on and somehow it started working again so I went ahead and set up the guitar. I then used lacquer thinner to blend the lacquer and hide the scoring I did when I attempted to take off the fretboard and then used Titebond to make sure the fretboard extension stayed put. I also only fretted it up to the body because I 1. Ran out of fretwire and 2. Didn't want to mess with fretting over the body with the neck still attached.

It ain't the prettiest guitar around but its functional and has been refretted so it'd be a perfect beginners instrument.