Sand down any words or rough spots that might be on the PVC cap.
Drill hole toward the open edge of the cap on one side. Mark a spot directly across and drill another hole.
Take a ruler and mark an inch wide strip with "V" shaped ends. Make it as long as you wish.
Thread the strip through the hole long enough to allow for them to reconnect past the edge of the PVC.
Pierce holes through the leather straps using knife / awl / or eyelet pliers, just above the PVC edge.
Place a short bolt through the holes on each side of the PVC and screw into a nut on the other side.
Lay one mirror on the mirror side and hot glue on a second mirror vertically with the mirror facing out.
Don't bother removing the labels since the box will be full anyway.
You can use the bottom of a plastic bottle.
This is for the planter portion. Build it in dimensions matching the board you cut previously.
Measure 1" over from the left and 1" up from the bottom and glue on the box.
Make sure you measure evenly between them.
Once you are done nailing in the design just remove the paper from around the nails.
You will also want to seal it for the outdoors with a Thompson's sealer or something similar.
You can simply screw in 2 short screws into the wood at an even level and then twist a piece of wire around them.