I've run across a PDF file containing dimensions for an AR-15 lower receiver before, but then lost the link. Recently I ran across a page containing CAD files for an AR-15 lower and DIAS (drop-in auto sear). The former is cool, but machining a lower would be difficult and time-consuming, and machining a DIAS is felony-level illegal due to the Hughes Amendment to the 1986 FOPA.
There's also CNC Gunsmithing, that shows a bit how to do the machining with CNC, and has a few prints available.
Magpul has dimensions for an M4 receiver extension online.
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