The black dot mid point through is my intended screw location. Thinking I will use a #4 1/2". The top nearest the hinge is exactly as you noted. I am hoping to mate the pieces well enough that there is little, if any, visible gap. On the butt plate end I may cut a small under surface level notch and insert the tip.
I am probably over thinking it. time to commit...
thanks for the interest! (and well wishes)