You can view this tutorial on one page and other crafts at my blog: www.aweekfromthursday.wordpress.com
Step 1: Supplies
1. Hot glue gun w/ plenty of glue sticks
2. Tape measurer
3. Cardboard Box
4. Xacto knife or box cutter
5. Cutting Mat [optional but very helpful]
6. Paint [optional]
*Images 1, 2, & 4 from Wikimedia commons.
Step 2: Make a Pattern
Measure out the desired length you want your shelf to be.
This one is 5" X 25".
Create a rectangular pattern using these measurements. Be sure to keep the pattern lines as straight as possible.
Step 3: Cut: Your Pattern
Now you're going to trace out two more cardboard rectangles. You can use the first one as a pattern.
Cut out all three.
During this time, you can also cut out the base of your shelf, which should measure 3 inches wide by 25 inches long. [not pictured.]
Step 4: Cut: Shelf Braces
Measure out a triangle brace that is 3 inches wide and 3 inches deep. Make the width and depth meet at a right angle. Connect them with a straight line across the middle. Cut one out and use it as a stencil for your next ones.
You will need to make 8 total.
Step 5: Glue: Braces Together
Step 6: Glue: Shelf Pieces Together
The three layers of cardboard will give it some strength.
Step 7: Trim: Edges
It's really important to the stability of this structure that every edge be straight and even.
Step 8: Assemble: 3-layer Shelf to Back Base
Have the hot glue gun ready and loaded. Mine sort of dried half-way through applying the glue.
Using the hot glue, connect the shelf to the top of the base at a 90 degree or right angle.
Hold and press down until it's completely cooled.
See that light shining through at the center of the angle? That's because it wasn't cut straight. I had to sort of seal it with hot glue. This tells me it probably won't be as structurally sound as I want it to be.
Step 9: Assemble: Braces to Back and Top Shelf
Start on the two edges. Glue the corner of the braces into the corner of the shelf. Press them in deep to add security.
Once you secure the outside two, then add the inside two, placing them in equal distance apart in the middle.
Step 10: Optional: Paint
Paint your shelf if desired.
Step 11: Mount and Decorate
I wouldn't put a book on this, but it's perfect for display of tiny things or candles.
I would have preferred to put another coat of paint on this, but I ran out.