For full tang knives that I can grind/shape handle after gluing up, I generally cut liner material to about same size as the scale, then glue it all up in one batch using pins to hold everything in alignment. "IF" all the grinding to scale has to be done prior to gluing to tang, then liner would need to be glued to scale so scale/liner could be shaped, grind, polished before gluing up.
Ken H>