Scibaer, when you get ready to do this, cut the top corner that fits up into the gun frame first. Knock the pin out of the grip frame and while holding those tight into the gun, mark the pin hole. Move out just a fraction before you drill it so the grips will be tight on the frame. Drill the hole and fit the corner into the grip frame nice and snug. Then you can trace the shape of the grip frame on the back side of the grip with the wood in place. From there on it's just cut, sand, and shape, sand some more, check, shape more, check, sand more, check, ......etc until done. Finish in your choice of finish and brag to your friends. I know the above routine from taking stag grips from a Ruger and fitting them to my Gaucho's.
I could never my own pair of grips from scratch. I have the patience to scrimshaw, but not enough patience to shape the wood. I'd get out the dremmel and likely seriously mess them up from there! 44 Man