I am reviewing options available to build a custom, integrated Windows 7 Ultimate ISO. The goal is to start with a fresh ISO, and then integrate updates, applications, drivers, etc., to end up with the customized installation ISO. My question: Can an x64 ISO be built on an x86 machine? The resulting ISO will be deployed on an x64 machine. I have reviewed some of the integration guides here at MDL as well as other tutorials online, but would like some feedback from MDL members. Though the obvious answer is no, still, I am not sure, so I pose this question to the experienced ones here. Thanks for your input.