I recently built a light box out of Plumbing pipes and joins - its not a large shooting surface maybe 1 and half square meter's, with an infinity curve built into it. Cost me roughly 300 bucks. Lights are next on the agenda. But it offers a lot of flexability when it comes to shooting a varierty of different sized products. I had an old sheet of white material used to create the curve. It has a matte side and a glossy side depending on the needs of the shoot.