How "kit" do you want it to be? The only really tough work on fitting the parts to the stock are the buttplates. If you are careful with all the rest, it is just a matter of removing a little wood, try fitting, remove more wood, and repeat as necessary. Butt plates need to be fitted on all three axis simultaneously. They give me the shuddering fits!
I recommend you check out Tennessee Valley Manufacturing, they have always done right by me. I've ordered 8 kits thru them and with the two little minor issues they got to work to make it right before the sun went down. Randy Heil runs the place now, good feller...about as good as what you find here in the PA forum. THAT kinda good.