In the past, I have used the ubiquitous Niedner butt plate and grip cap but I am now looking for a butt plate. On the last sporter that I did I used a Winchester M 70 butt plate but it appeared to be rather chunky and bulky. It did not have the deep bow in it nor was it rounded to the sides like the Neidner
You might try rounding the edges of the clunky Win plate and adding more curvature if wanted. I too like the Win plate except for the square edges, and there's plenty of room for rounding. Also you might consider heel-&-toe plates or a skeleton plate instead. Several Guild members offer high-quality plates but they are pricey.
A suggestion for checkering is to ask someone who does it on handguns; one of my smith friends has used my electric checkering tool for many years on his Colt Government builds.
I use a Galco velcro add-on pad during the off-season when in shirtsleeves, it solves the slip-&-slide-on-hard-surface problems nicely.