Interfacing a FPGA to an Intel processor
If you have a spare processor, I think the best way to go about adding an fpga to it would be to buy a motherboard that has a PCIe slot and add in a pcie fpga card. Done and done.

Trying to redo the work of hundreds to thousands of people working full time for years is borderline insanity or more probably simply engineering mis-estimation on a gross scale. I'm sure there's also plenty of information that's only shown to OEM's which would make an attempt at spinning your own board to support such a beast nigh impossible.

If you want to play in processor/fpga land, your best route in both a time manner and cost manner is to buy a solution that allows you to play in. The cost of your engineering time to make such a solution would run well over the cost of these already made solutions.

Alternately, if you really just want practice getting a processor fitted with an FPGA for the experience, don't bother using your intel processor. Go with something much lower powered and more open. It'll be cheaper and you have a chance of succeeding. Once you succeed at a smaller level, you may decide to work your way up. You're just about guaranteed failure if you start this big with this processor.