I was making my static analysis programs as an easy-to-use tool. It's a little weird that VCBuild seemed not work on x64: it did not take the right include/lib path. Even using the /u option, it might fail to link, and the unicode set did not function (it tried to link with the ANSI version of Windows API). So now I use the x86 version rather than the native x64 version. Someone got the similar problem long ago.
Another headache was about Phoenix. I tried to integrate it with Orcas, and finally it worked (VS 2008 beta 2 frontend with a nightly build Phoenix backend) with my own plug-ins. But the compiling performance was really terrific. No idea what was going, it was rolled back to VS 2005.