Crowd funding is great for many things, but not for a fab. We're talking >$1 BILLION in capital per plant required just to replicate existing technology (not even to begin innovating). Still, if you can raise $1B in a crowdfund, we'd love to know your secrets!

You don't need the fab, you hire one of the existing ones to build it for you. nVidia does this for example (and ATI did as well)

You can license the ARM IP from a company as well (I mean, not just the instruction set IP but the actual implementation as well)

I doubt that the poster is proposing to build the plant, so much as build the CPU in a plant.

simple, lets start a government.