Specifying the Changeset in Team Build

In TFS, we have a need to put the specific version in the automated build process. This is for re-building the recent release version of the web site. Since there is no GUI option to do this, there are a couple of ways to do it by editing the .proj file. The method described at the link below seems to be the best one:
Nagaraju Palla's WebLog : Examining Get Task in TeamBuild
Overriding CoreGet method will retrieve the version of code you specify and that is the version that will get built in the end.
Here is the link to MSDN documentation on the TFS Get command.