Personally, I really don't recommend building your own board for the Edison if you haven't had some experience with designing PCBs beforehand, mostly because of the compactness of the 70-pin connector. At launch, we'll be hoping to be able to recommend external board designer/builder services that'll make this easier (working on this right now). Unfortunately, we don't have something of the sort who we can recommend (let along a service provider who's cleared an NDA).
If your are interested on building your own board to connect to the Edison computer module, you might want to check out these two documents:
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For those of us that are used to designing boards for small pitch parts, what other documentation resources are available with your NDA for this product? I've executed NDA's for other Intel CPU products, who do I need to talk with to get this access?
I'm currently laying out two Edison boards that I hope will be released for fab early this week.
It would be nice to have a design checklist from Intel.
I agree that small pitch SMT isn't for noobies.
It would also be nice to have schematic and pcb layout for the breakout board and arduino board as reference designs. Unable to purchase them yet from either source referred to by the web site to verify operation and design details. Seems even bare Edison modules are leaking out delayed to Sparkfun, now next week instead of this week.
I designed a simple Edison add-on board on Eagle; you could take a look at the Eagle files to see what is involved and plan your own board. It is not too hard to do if you have any experience with 2-layer pc board design and solder reflow of SMD part. This board is for a multifunction device with buttons, UART, USB devices, DC motor control, and orientation sensors, etc. Simpler add-on shields with a single function, such as a sensor breakout would be very simple to design, and OSH Park makes the pc boards for next to nothing.
Sparkfun Edison module stock update as of this evening -- just a few left:
431 in stock Thu Sep 18 13:54:41 MDT 2014
426 in stock Thu Sep 18 15:04:03 MDT 2014
413 in stock Thu Sep 18 21:18:27 MDT 2014
386 in stock Fri Sep 19 06:00:34 MDT 2014
151 in stock Mon Sep 22 12:18:04 MDT 2014
123 in stock Mon Sep 22 16:42:19 MDT 2014
61 in stock Tue Sep 23 13:03:38 MDT 2014
54 in stock Tue Sep 23 14:09:48 MDT 2014
53 in stock Tue Sep 23 15:00:53 MDT 2014
50 in stock Tue Sep 23 16:11:19 MDT 2014
44 in stock Tue Sep 23 19:07:13 MDT 2014
28 in stock Wed Sep 24 08:26:32 MDT 2014
24 in stock Wed Sep 24 10:07:09 MDT 2014
22 in stock Wed Sep 24 10:27:35 MDT 2014
19 in stock Wed Sep 24 11:36:00 MDT 2014
17 in stock Wed Sep 24 13:05:16 MDT 2014
12 in stock Wed Sep 24 13:26:32 MDT 2014
11 in stock Wed Sep 24 16:04:49 MDT 2014
9 in stock Wed Sep 24 17:45:38 MDT 2014
8 in stock Wed Sep 24 18:19:42 MDT 2014