Adding the decorative trim pieces to each door
The Miter Sled
This is a custom built miter jig. It is designed to cut perfect 45 degree angles, and you do not have to worry about which is the right and left side of a cut.
It also includes a number of clamps, tracks for clamps that are not stationary, tracks for various stops, and even safety blocks to protect fingers from getting cut.
The extra clamps and safety blocks are necessary because some of the trim pieces being cut are only 1 1/4 inches long and would be unsafe to hold by hand.
After the decorative detail pieces have been cut to length, they need to be sanded. It is usually easier to sand before they are glued in place rather than after.