I have never made pistol grips. I did make a stock for an SKS. I cut the stock out and fitted it to the gun. After I got several coats of linseed oil on the stock. I put it back on the gun to see how it was going to look. The stock didn't fit any more! Lucky for me all the areas that needed to be refitted were not exposed. I refitted the stock and every thing went well from there. I would double check to avoid any rude surprises.
The grips will look nice on your new gun. I hope you get many years of use out of your new revolver.