I have managed to use imagex to import my vista x64 and x86 isos into the install.wim files, and have then imported licence files under sources in boot.wim on the w7 iso it is currently using to boot.
Windows 7 appears to work fine and the installer displays all vista images within the .wim....
It manages to copy files and expand them, but upon restarting the system and being presented with the: "please wait while windows sets up your computer..." the vista installer loads and i'm presented with the message: error Windows could not start the installation process.
Upon reboot I am then presented with this: "The computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed. To install Windows, click "OK" to restart the computer, and then restart the installation. When clicking "Ok" the computer than enters a continues loop of death producing the latter error.