I'm looking at things like this materials list from the Sonoma Shanty plans that I purchased a year ago. I'm looking at the stick-built version ... instead of buying more expensive plans. Particularly since I don't need to run this past the Planning Commission.
The Sonoma Shanty plans are for an 8' x 15' and I'm building an 8' x 20'
but they are really helpful.
As are the 8x20-tiny-solar-house-plans.pdf
They don't cover plumbing, electrical wiring, cabinets, etc. I can get books at Home Depot, Lowes, or Camping World for those. But they do help in the basics of getting it framed up and dried-in. And give me an idea of how much of what I'll need to buy to do exactly that.