Either type riser about the same. Bandsaw the grip you want leaving about 3/4 in. Too big then as you shape it down to size. I start the throat first in the belly front corners rounding them out and finger grooves o the sides. Then work the rrest of the grip down until it feels good in the hand. Getting the throat area really close to final sanding then straight up to the shelf above the deepest part and Mark it and round the shelf leaving that marked spot high for the pivot point.
There are several U tube vids on this subject.