Home scale spinning frame (multiple spindles, one hand crank)

Hi! I hesitated to post here, because I don't have pictures yet, but I am working on a spinning frame. In India, this particular type is called an ambar charkha. You may have seen them as an e-charkha. I am making one out of 3D printed parts, hoping to put the whole thing out on the web so anyone can make their own spinning frame. I started with the idea of a water frame (like the ones Arkwright invented in England) but I saw they were using basically a mini ring spinning mill in India so I wanted to go whole hog on that design. I am really excited about the project! I was planning to make it a sort of flexible design, where you could use it for wool or flax or cotton, but I wonder if people on here have any commentary on what THEY would want out of a machine like that?