Today I wished to see if I could still be able to compile the Source SDK and I made it. It just had a little problem with QC_Eyes using Visual Studio 2013.
First when you try to compile it you will receive an error about missing
nafxcwd.lib, which is related to Microsoft Foundation Classes. In particoular QC_Eyes is supposed to be compiled using the Mult-Byte Character Set version of MFC, which is deprecated in the latest version of Visual Studio.
The fix for this is actually pretty simple as said in an official Microsoft post (reference).
Just install the package linked here and you are ready to go.
Hope to have helped you. Mattias