Mike

Rusty, a very nice guard design, but it will not work on the project you mentioned: the Magic Box. Once the box is assembled you round over the corners, and the guard would not allow for this. It is however a perfect way to attach above the table dust collection. Safety pins are still the answer. I like to use season 4 of the Router Workshop for examples since this DVD has been out the longest. When routing the profile on the window mullions you need to be able to get into 90º corners. This is only possible with a safety pin installed.
Bob Rosendahl will tell you that a safety pin should be installed between you and the bit. As you know from the mounting plates you own the holes for locating the safety pins are to the right of the bit, both for the long and the short sides. With disagreement between manufacturers on the best way to use safety pins it is not surprising to find it here on the forums.

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Mike