The advice you'll been given and ignored before is more useful now than ever.
You need to stop, quit drawing schematics, sampling hardware and drawing circuit boards and define what you're trying to do, including:
1. What is the target application? A general purpose development board to try out things? A board to be used for an application?
2. What makes this board different or better than the alternatives? Yes, you can pack it with features, but why should a person want your board instead of existing boards, perhaps designed by someone more knowledgeable in the field?
3. Who is the target audience of the board, and how will you reach this audience? If your audience is readers of ElectroTech, you need to think about how your talents are perceived here.
3a. What features are important to the target audience? What do they absolutely need? What features are desirable? What don't they care about? Tied to this to some extent is what programming languages does your target audience use? Are there any hardware features important to that language?
4. How will you supply this board? Assembled? A kit with parts? A bare board? If you're planning on a bare board, you need to design around parts that are easily available from many sources, including sources not in the US.
5. How will you fabricate the board? How much are you willing to invest in the hopes that someone buys these?
6. How will you license this/these boards? Creative Commons? Open Source? Will you be willing to let other people fabricate their own boards?
Those are but a few of the questions you should have answers to before you draw out a schematic or lay out a board.
Consider the TAP-28 board for a moment.
Why? Because at that time, printed circuit boards were expensive. The cheapest I could make a small quantity of boards was $75 for three. In order to get boards at a reasonable cost, I had to make 24+ at a time, which cost over $100. This is not the case any more. Ten boards for less than $20 delivered.
What's different? The TAP-28 was designed to support applications with a cheap board – TAP = ThrowAwayPIC – a board cheap to assemble with features to make it usable in the real world. It doesn't have bells and whistles, but it provides a basic building block for creating some amazing stuff.
Components required? There's nothing on the TAP-28 board that a reasonably stocked hobbiest won't have. And most of the parts can even be purchased at RadioShack.
So how much did I invest in the TAP-28? The first batch of 20-some boards was over $100. The second batch was about $250 for a hundred boards. The design and documentation took weeks of my time. The results? I had cheap boards for my projects. Hundreds of boards have been shipped around the world. I made back my monetary investment after only a couple years and enough "profit" to have a cheeseburger on the way to the post office when I had boards to ship.
Read that carefully. To build boards for $2.50 a piece, I had to buy 100 at a time. A twenty dollar bill will buy 10 today and get you change.
Oh yeah, what documentation are you planning on providing? If someone is going to use your board, you'll have to provide legible schematics. Seems like you've had some problems with this in the past as I recall?
You may create something amazing, but only if you stop and think before you start to do.