First, that is a lovely quilt top. You can do straight stitch quilting, but as others have said, it is physically hard work with lots of starting and stopping. One thing you could do is purchase a half sheet of composite topped with Melamine, a white plastic like formica. Cut a hole for your machine. Put blocks (books, or whatever) under it to bring it level with the machine's work surface. You will have a solid surface that can be stored behind a dresser or some such when not in use. A friend's hubby bought an old, oak desk and cut a hole in that for the work surface, but I gather you have a space issue as well.