Just tried setting up a first Matrix build and was a bit surprised with the
SCM/workspace interaction.

Having Axes:
Config=Debug Release
Platform=Win32 x64

I had 5 copies of the project checked out. First into the main workspace, then
into the 4 Axes matrix.

The one build area would have been fine for use on these 2 Axes as the workspace
already knows through parameterisation how to separate the build results.