Hi, MIke:
Before you install W7 x64, you should make your set of W8 recovery media first.
Then you need to change some BIOS settings. Please read the following link.
Because your model is a CTO (configured to order), I do not know what graphics adapter or wireless card it came with.
So, if you let me know that info, I will see what W7 drivers I can find.
In the meantime, all of the W7 x64 software and motherboard drivers from this slightly older model should also work on yours. If you have a nVidia graphics card or just the onboard Intel graphics, then the graphics drivers from this model should work as well.
DO NOT USE ANY BIOS OR FIRMWARE FILES FROM THIS LINK