Check with a machine dealer. They do make them for Singer featherweights that are not free arm. I believe they are also available through catalogues like Clotilde or Nancy's Notions. I purchased one for my Bernina and then broke it in half. Lucky for me my husband is a machinist. He used the broken one as a pattern and made me a new one out of plexy glass. He was even able to use the legs from the old one. It is not quite as heavy a material but it is more flexable and I have not managed to break it yet.
What I love about it is that it is see through. I have the added surface on top along with a great place to store things underneath that are visible.
The table another poster linked to is great also but rather expensive. It is also rather small. At one time Staples had a computer table with a cut out it in that worked the same way but was not on wheels. They may still be available. Two of my friends who have a custom drapery business use one of them for their Berninas.