Making Area 51 better for non-tech proposals
An early example of a good question, straight from the A51 FAQ:
"Don't suggest questions like 'How do I unclog a drain.' Instead ask, 'If you run 2.5 GPM through 50 feet of 1/2" galv pipe, how many psi will be lost to friction loss?'"
As I alluded to earlier, users with a lot of existing SE rep count more for the pre-beta process. Perhaps users who suggest lots of expert — i.e. friction-loss-style rather than unclog-style — questions could also count more? I'm not sure how to implement that; I'm against adding yet another box for "this is/isn't an expert question," but looking purely at "this is a great on-topic example" counts isn't perfect either.
What non-tech proposal evangelists can do to get followers/supporters
When you figure out an easy answer for this one, please let me know; I'm struggling to drum up interest for a proposal, too. Until then, I can only suggest getting people excited about the site and finding ways to advertise it. Maybe ask what they've always wanted to know about woodworking but didn't know how to find out, and then suggest that they could get an answer if they helped create a woodworking SE. Or, depending on the person, play on the desire to help others and/or share expertise and/or look better/smarter than others.
Okay, I apparently misunderstood you at first. The psychology concept of the foot in the door might help you here. It's definitely harder to get people to commit to creating a site than it is to get people to join an existing site. But it's much, much harder if you try to explain the whole commit process to them right off the bat. Maybe you could first explain the concept to your friends as if the woodworking site already existed. Then, if they're interested, explain that you just need to find a few more people to sign up to use it for it to be created. You might use the proposal page to say "these are the kinds of questions you would see once the site got up and running," and invite them to think of potential answers or their own questions.
Your comment focuses a lot on getting people to agree to use their time and energy on your proposal, but doesn't really touch on web savviness. Is there anything about the actual website that you think would make this difficult, or is it just the fact that all these steps exist?
I know that there is a stated aim in Area 51 to be slightly difficult to use in order to discourage noise.
but I believe you're misinterpreting the stated aim. The idea is to build a community of woodworking experts, not a community of especially web-literate people who happen to have some experience and/or interest in woodworking. The rationale is in the A51 FAQ: "Remember, the pro sites WILL attract the enthusiasts, but not the other way around!" Creating a particularly web-literate community would not help with that end goal.
Is Area 51 unintentionally biased against people who don't already use trilogy sites
No. Area 51 is intentionally biased in this way. For better or for worse — I'm personally divided on this issue — the fine folks at SO, Inc. decided that they would give more weight to existing SOFU users because they would already understand the UI/community rules, and be able to focus on content. It's kind of like how new elephants at the circus are placed between more experienced elephants in training. FWIW the difference between the weights of experienced users and new users has been scaled back twice so far.
And therefore also biased against non-technical topics?
This is, I think, a separate issue. Many of the current users of SE sites are people with high-tech backgrounds, simply because they were users of the tech-oriented SOFU trilogy before SOFU expanded into the more general-purpose SE network. When Area 51 opened, many of those people naturally thought, "hey, now I can make a SO-like site about [my favorite technical topic that is considered off-topic on SO]!"
So while there are certainly many technically-oriented SE sites, I don't think that's indicative of a built-in bias. Percentage-wise, more SO users are likely to care a lot about advanced Ubuntu than about advanced usage of the English language or advanced cooking. As the network grows and the initial pool of techy people becomes a smaller part of the whole, this problem should resolve itself.
How do I help this proposal get more followers and supporters who are great at woodwork but not necesarily very Web Savvy?
For me, this is the most interesting part of your question.
Now, I admit that, as a young person who works with computers and code on a daily basis, my definition of "requires web savviness" may not mesh with the general population's. But that said, I've always thought of the SE platform as quite welcoming and intuitive for new users. Sure, we get occasional questions on Meta about people trying to change upvotes to downvotes by undoing the upvote first and then clicking downvote, but they're pretty rare considering the volume SOFU sites see.