I think lot could depend on the quality of your plans and directions,
ran across this thread from 2008 on plan quality,
http://www.tractorbynet.com/forums/customization/116234-plans-sale-via-net-any.html
I know when I was young and just out of high school (40 plus years ago)I ordered a set of plans of a DIY bull dozer,
when I got them I was totally disappointed, (not that they were not good plans if you knew how to read a blue print) there were pages and pages of drawings but I do not remember a clear step by step process of assembly ( at least not clear to me) and even it there was if one could not make heads or tails out of the pages of blue prints,
years later I rediscovered the set of plans and they were a good set of proper drawings, if there would have accompany pictures with the drawings I think I would have caught on,
to day one has video and even pictures,
what I am saying is if you can do a set of plans that a true newbie can build, with little or no fabrication experience, when I bought the plans I could weld and had built a few things in shop classes, but not off of drawings, or following some one elses plans,
when one draws up some thing and understands things it is hard for one not envision some one else not understanding or seeing it how you see it,
regardless of what you come up with, unless the newbie can read and understand the directions, what you sell I think will depend on how you build your support materials, but this is some thing one may need to keep in mind,