Step 6: Adding the Top
Instead of a wood frame I decided to use some metal flaps that just bent up over the plexiglass while it rested on the top of the container.
The first step in building the top is getting the plexiglass. I measured the top of the container. Then I went to the local hardware store and they cut a piece of 1/4" plexiglass to the dimensions I needed. Then I placed it on top of the container to verify it was the correct size.
After I verified the size of the plexiglass I dug out three pieces of heavy duty scrap metal to make the metal flaps. The way it worked out one was already bent, the second had holes the exact size of my pop rivets and the third had neither.
First if your pieces of metal need holes figure out where you want them. (I did this by the very scientific and precise method of holding them up to the container with the plexiglass in place.) Then mark the hole locations on the metal pieces. This would also be an appropriate time to mark where you will need to bend the pieces. Once you marked them clamp the metal into a drill press and drill out the holes. After drilling clean the sharps edges and excess material away with a Dremel and a round needle file.
When you've drilled the holes it is time to bend the flaps. Lock the metal pieces into your bench vise just below the line you drew on them. Then if it is thinner metal bend it ninety degrees with your hand. If the metal is really thick apply multiple mighty wallops with a ballpean hammer until it is bent ninety degrees.
Now that the metal pieces are bent hold them in position with your hand on the plexiglass while it rests on top of the container. Using the metal as a template mark where you will need to drill holes for the rivets. Now use an awl to make small starter dents in the plastic on these marks. This will keep the drill bit from walking. Then drill out the holes with a hand drill.
Insert rivets into the holes in the metal and plastic. Use your pop riveter to secure them. Once the flaps are in place remove the protetive covering from the plexiglass and slide it into place.