I did not grain fill the back of the body on my TL-1TB build. But I do not think it would hurt if you did! And filling in a colour that matches the stain should be good (though I normally fill in the natural colour of the wood - but have had issues with the filler absorbing the stain too much).
PitBull Builds: FVB-4, LP-1SS, FBM-1, AG-2, TB-4, SSCM-1, TLA-1,TL-1TB, STA-1HT, DSCM-1 Truckster, ST-1, STA-1, MBM-1, MBM custom, GHR-1 (Resonator), FH-5V (Acoustic), DMS-1 (Mustang).
Scratch Builds: Pine Explorer, Axe Bass, Mr Scary, Scratchy Tele's.
The little voices in my head keep telling me "build more guitars"
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