You can make a "glass" counter quite easily, using for glass part of the transparent plastic "blister" from packaging. I used a toothbrush package. The method is very complicated to describe, but really easy to do. You don't need to follow the directions; you will probably be able to figure out your own method.
You'll need a U-shaped piece of "blister" about 1/4" x 1/4" x 2 inches, and a small piece of cardboard. In the first picture you can faintly see this plastic, as well as the cardboard. You'll also need some coloured paper and if possible some metallic paper or adhesive-backed metal foil.
The top diagram represents the finished counter. The pale colour indicates the "glass" top and front. I've marked with
a black dot the centre of the front.
1. Start with a piece of medium-thick cardboard about 1" x 1/2". Score and fold it in half lengthwise. Half will be the back
of the counter and half the base. Both will be covered by paper.
2. Cut three strips of paper in a colour that will complement the rest of the shop, each strip 1/4" wide. Two should be 1 1/2 inches long and the third 2 inches long.
3. First cover the base, by gluing one of the shorter strips on it and wrapping the excess underneath. Glue the excess under the base.
4. Get your piece of transparent blister pack, and place it on the base with its open long side down. You will have a transparent top and front, and the short sides will still be open at this stage.
5. Use the remaining shorter paper strip to cover the back of the counter, but wrap it round both the cardboard and the plastic at the back. Glue the excess behind the back.
6. Check the contents of the counter, because you are going to seal it up now. Take the last and longest strip of paper, and fold it so that it will go around the back of the counter and double back on each side, as I hope the diagram indicates. Glue it to the back, and lightly glue the edges of the sides in place. (There is no real gluing surface, but just enough glue to hold the sides in place will help with the next step.)
7. Cut very narrow strips of edging (see above) and glue them as trim
that will hold the sides in place. This is the trickiest part, and if you do have access to those nice wooden
or plastic model railroad strips, you'd probably find them worth using.
Cheat: glue cakes, plates, boxes etc. on the counter top in strategic places to help hold it together.