Mine is made out of several small pieces cut from a 2x6, and can hold mirrors in the 6 to 8 inch range. You can scale it up or down by using 2x4 lumber or 2x8 lumber. To make it, you will need the following materials:

• One piece of 2x6 lumber, at least 29 inches long.
• One 1/4" x 2 1/2" machine screw (length is the only important dimension. The screw diameter and thread don't matter, except the tee nut and cap nut must fit it).
• One 1/4" cap nut.
• One 1/4" Tee nut.
• Two round head wood screws.
• Eight 3" wood screws.
• Wood glue (can use Elmer's white glue).

and the following tools:

• Saw
• Drill with bit the width of the skinny end of the tee nut
• Hammer
• Screw driver

To assemble, refer to the diagram, and:

1. Cut three 12 inch pieces and one 5 inch piece from the 2x6. Lengths need not be exact.
2. Drill a hole in the center of the 5 inch piece, as shown.
3. Put the tee nut in the hole and tap it in with the hammer. The side with the tee nut in it is the bottom.
4. Put two of the 12 inch lengths on either side of the 6 inch piece as shown, and fasten with glue and 2 wood screws on each side.
5. Take the third 12 inch long piece and fasten it between the other two as shown. Try to get it as perfectly vertical as possible (a carpenter's square would be handy). Glue and screw this together.
6. Now screw the 2 round head wood screws into the bottoms of the 2 side pieces as shown, insert the machine screw into the tee nut from the top, and put the cap nut on the bottom.
7. Admire your work. You are done.

The mirror sits on the stand vertically, and the machine screw is turned to adjust the tilt of the stand. Make sure that even with the machine screw out as far as it will go, the stand does not tilt forward. You can adjust the maximum forward tilt by screwing the round head screws in more.

If you are paranoid about your expensive mirror falling forward, make a clip out of a small scrap of plywood with a wood screw through it, positioned just above the mirror as shown.