Check out these amazing replica Altair 8800 kit, composed all new (or new-old stock) parts, with the original instructions for assembly. The Altair 8800 was the microcomputer ancestor of the PC — the computer that inspired the PC revolution. It was — to some approximation — the first useful computer that you could build and run in your home workshop. Regrettably, these kits are only sold on eBay, making them a pain to acquire, but the idea is just fantastic, and it sounds like the build-quality is terrific.
(via Make)