I added the bottom shelf by using (4) 1x3's. I also swapped out the 1x4 back for a 1x6 to give the top shelf more height. Lots more details on my blog.
Built from Plan(s)
Estimated Cost
$45 without finishing supplies, $70 with.
Estimated Time Investment
Afternoon Project (3-6 Hours)
Finish Used
Sealed the boards with conditioner, then used Minwax red oak stain, followed by 2 coats of wipe on poly. If you do the shelves, be sure to sand and stain the edges of the boards first. Otherwise, you'll never get the stain in between the cracks!
Recommended Skill Level
Beginner