I use medium jumbo, so they cover quite a lot, but the marking error sort of went more false the more I marked the frets. Calmps (or a clamp) must have moved more and more as I proceeded.
The first frets are the worse, but I'm pretty sure that medium jumbo frets will cover the filling.
Actually, now when I come to think about it, I'm not that worried about the fretboard side. Fret slot endings are something that might come out quite ugly... but fortunately I didn't saw the slots even near to the final depth and I haven't done my radius yet, so possibly my radius is going to get rid of some of the mess there.
Also, one problem is that I made a shallow slot for a nut and that's the worstly tilted slot. There's nothing covering that one.
It's a bit do/don't -situation. It might drive me nuts if the fillings shows clearly after the finishing... on the other hand, if everything comes up nicely, i'll be happy that I didn' go back and begin from the scratch, It's a nice piece of wood anyway. Unfortunately I would able to see the final situation after I have finished the neck.
Maybe I should experience a bit with scrap wood and make a decision based on that.