i) CNC - 1951 - Not new at all - However its price point is completely new dropping 10X in price since my university paid $250,000 for theirs, now $20,000. Also skills are increasing rapidly no longer limited to several schools, but being taught everywhere.
ii) There will always be costs. Given the drop in costs above to use CNC on-demand means the costs are reasonable to get this started. Ten years ago would have been impossible.
iii) Can the end-user/maker finish the stool (paint/varnish)
iv) Working with raw wood which has its market. It's not everyone, but I believe large enough to get this started. Other options are available later, melamine would be easiest and ot expand this system into solid woods.
v) With the right designs none of the additional labour you mention is needed. http://creativecncdesign.com/wp-content/uploads/2010/12/cnc-...