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All you need is a simple frame made of 4x4 wood and some silk, and a Stapler.
This video is about cars and he's going for a completely different look, but the priciple is the same and ofcourse you can also shoot through. And you need additional lghts and reflectors.
And yes, i'm talking about reflective surfaces, like plastic, metal or laquer. Especially when they are bend or curvey they behave like a fisheye and reflect not only the lights, but also everything in your studio. Or the oposite, your Octa becomes a small spot.
While you don't need a box, black cardbordish stripps around the frame will help you to controll spill, but will make that thing more clumsy to handle.
Oto, if we're talking about a handfull of chairs ther's nothing wrong with compositing. Thing is, the cost for material is neglecteble, construction is fairly easy even if you want to reproduce the Manfrotto solution from the above video, weight is not much of an issue at this size, the learning curve is doable and the closer you get your pictures to "finished", the less time you spent in postpro.