Materials - Excluding the teleprompter mirror, I purchased the parts at Lowe's,
but you can find them at Home Depot or hardware stores

Pine Board - 1" x 3.5" x 6' - Qty 4 @ $1.50 ea

Wood Board - 20" x 20" - about $3.00

Miter Saw Set - $7.96

Mend Plate Kit - $2.38

Iron Corner Kit - $2.86

Teleprompter Mirror - 23 1/16" x 23 1/16"
 

Pan Phillips Screws 10x1-1/2 - Qty 4 for about $1.50 (box of 50 for $4.50)

Total time - construction took about 1 hour. Most of that time was spent carefully measuring to make
sure there weren't errors.

Tools

Drill - used to drill paths for screws and as a screwdriver

Table Saw

Vice grip

Sharpie permanent marker

Ruler

Instructions

Step 1 - Use miter saw kit to cut two 45 degree angles on the ends of the pine boards

Step 2 - Cut wood board to desired size (20"x20" in this picture)

Step 3 - From unused pine board, cut two 20" supports for bottom of pine boards. Use ruler and marker to position it in the middle. A vice grip can be useful to keep it in place while drilling. Use the longer screws to connect the boards.

Step 4 - Repeat with the other board.

Step 5 - Attach supports to the inside of each board.

Step 6 - Screw board onto legs. See result

Step 7 - Cut pine board to the same length as your main board, and use the mend plate kit to screw it to legs. See result

Step 8 - Repeat step 7 on other side of legs to add more support.

Step 9 - Mark screw locations on the 45 degree angle of the boards and on the teleprompter. Drill holes to make screwing easier. Use short 3/4" screws to attach mirror to boards. See result

See finished teleprompter stand

More pictures: 1 2 3 4 5

Optional height adjustment

Between steps 2 and 3, add holes and bolts, and two more boards to make the height of the legs adjustable. See picture

Finished teleprompter: 1 2