I have selected to do five frames of 12" wide by 18" high with a 12 inch space between them, and 4" betwwn the top/bottom of frame and chairrail/baseboard. Also, on each end I have an 8" space until the next wall.
My question is: "Is this frame sizing and spacing okay? Are there any formal carpentry rules to follow here? Is there a reference book to use??
Help is greatly appreciated.