I think generating the solution is a little extreme.
The solution file structure hasn't changed much since 2005 http://msdn.microsoft.com/en-us/library/bb165951(v=VS.80).aspx, and there are a few projects trying to automate their generation, like Premake https://bitbucket.org/premake.
However, the kind of scenario you describe, might be I believe (better?) adressed with t4 templates http://msdn.microsoft.com/en-us/library/vstudio/bb126445.aspx, or only project file generation.