The problem with blogs is that shortly after something interesting is posted it is moved to the dusty archives in the recesses of the blog and only ever uncovered by the occasional google visitor. I came across, courtesy of google, a series of articles at SaysUncle on building an AK all the way from a flat receiver which was written before I started reading gun blogs.
The start of the project. From Part 1.
If you missed this series back in 2005 I highly recommend having a read of it.