Here is a picture of my finished product. The ironing board part is removable.
Here are the step by step instructions and pictures.
This is my TV tray. It has a raised edge around it that angles outward.
I cut a piece of cardboard to fit the green area of the tray.
Next I cut a slightly larger piece of cardboard that went to the outside edge of the tray and hot glued it on top of the small piece of cardboard.
I used my scraps of Warm and Natural batting to pad the cardboard. I cut three pieces the size of the top cardboard and hot glued them on at the outer edges only. You can see the shiny spots of hot glue showing through the batting.
I pieced the last of my scraps together by putting the raw edges next to each other and ironing strips of iron-on interfacing to both sides of the batting to hold it together.
The top (4th) layer of batting I rolled to the back side and hot glued it to the back. I wanted to cover up the hard spots from the hot glue on the front side.
Then I added a layer of silver ironing board fabric a little larger than the top layer of batting. I rolled it to the back and hot glued it down also.
Next I cut a piece of fabric (old sheet) a little larger than the cardboard. I sewed a casing around the edge to put elastic in.
I put the cloth cover on the ironing board and pulled the elastic as tight as I could get it. I pinned the elastic together, cut off the extra elastic, took the cover off, sewed the elastic ends together and finished sewing the casing closed.
Here is the backside of the TV tray ironing board with the cloth cover on.
Here is the front side of the TV tray ironing board with the cover on. The hard spots of hot glue can no longer be felt around the edges.
The finished product one more time.