Granny,
I suggest you look at a few sites for longarms and you will find they all have tables with tracks to allow the machines platform (also with wheels) to move freely in circles, curves etc. I had an older Handi Quilter that the pieces that hold the quilt clamp to a table or wooden shelf supported by a table and the tracks tape down to that shelf or table. Can be easily broken down and stored under a bed. It will use your sewing machine. The larger longarms are in need of their own tables. If you do many small items like baby quilts perhaps you can purchase the size tables they use for shows. Much shorter and easier to find space for.