I have really been enjoying every ones homemade cars: keep them coming. Homemaking cars has been one of the more enjoyable parts of the hobby for me.
A homemade aquarium Car was made by cutting out the windows of a small Lionel box car like Gold Bullion car in a prior post. A Lionel Aquarium car sea background was purchased at a train show but one can be made from parchment paper. Plastic fish were cut out of clear plastic form old toy boxes and colored with Sharpies. The fish were suspended from the roof with 4 lb fish reel clear leader line and glued to the fish and roof with glass clear cement. This allows the fish to wiggle and move with the train motion. Lights were added to the roof and a pickup made.
This is my favorite home made car I have built. The action of the swinging fish is great when the car is moving and it has a smallish 027 size.
I have since purchased a Lionel Aquarium car but run this homemade one more often.