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I am a former long time executive for an upscale furniture chain of traditional and custom made furnishings.
A few comments on your discussion if you don’t mind. Edgar is very correct about the traditional construction of sofas. It would be practically impossible to accomplish what you are contemplating. A traditional tailored sofa requires too much actual upholstery work on the frame to make interchangeable fabrication practical.
HOWEVER, there are new construction techniques that would suit your needs very well. They do make “paneled” sofas, essentially components upholstered separately and then bolted together. This is not the preferred construction, but it makes production much cheaper.
You could make fabric coverings for each component that can be changed. The problem of course would be fit. It would be difficult to make a slip on cover as taught as an upholstered cover for obvious reasons. However, I think there are ways to overcome that. One is to design a less tailored sofa, along the lines of the overstuffed “shabby chic” concept. Domain used that concept for awhile. It mitigates the need for taught fabrication.
I do believe your concept is valid for some markets. Some consumers would like the changeable fabrication option. Furniture purchasing, especially for upholstered pieces, has changed from being a onetime investment to a much more disposable design element. With the advent of HGTV everybody is now a “designer”!
Here is the big issue that I see. Quality fabric is a major part of the expense of any sofa. This will add significantly to the cost.
I’m not sure of your marketing plans, direct to consumer or through retailers but obviously you will have to pay close attention to costs.
Good luck, if I can be of help let me know.