this is better than our sandbox concept....the covering unfolds to make benches! Shoulda thought of that! If you want to make a sandbox though...here are our steps: http://www.dana-made-it.com/2008/07/tutorial-how-to-make-sandbox.html
All you need is 5 cups of regular flour and 1 cup of baby oil. Simply mix the two together and it turns into this silky soft sand. You can throw some sand toys into your tray or you can use items such as spoons and measuring cups
I just found a canoe at the lake with a hole in it and drug it into my yard! Upcycle an old boat/canoe into a sand box. Abram would be wild about this! You could even make a sail out of tarp that can also double as the sandbox cover.