How feasible would it be to scale this up to several feet in diameter? Like if you wanted to scan furniture? The device itself by default looks to hold much smaller items.

I'm new to 3D scanning but very interested in trying it myself. I'm looking at OpenScan (€203+) for scanning small Japanese souvenir handicrafts. Does anyone know if this pricing is competitive, or are there better options in this price range?

I do wonder how good results you could get with a good capture setup, good macro lens, and high-resolution DSLR. Of course combined with state-of-art software. By the specs something like Canon R5ii + 100mm 1.4x macro should get up to almost 3um per pixel resolution; intuitively that should result also very high detail 3d models. Managing depth of field might be a problem though.