I made a frame of 1x 3 inch boards. You can bolt together or buy clamps so you can adjust size. I use large push pins to attach the layers and then thread or pin baste. You can get pieces at Home Despot or Lowes and cost is about $30 for two 8 foot lengths and two 10 foot lengths. Can be taken apart to store.
Works pretty well for me. I actually use it outside as no place large enough to use conveniently inside.