New submitter mondalaci writes: This article is about building the Ultimate Hacking Keyboard step by step, starting with an Arduino. Lots of pictures and nerd talk included. It's a mechanical keyboard that can split down the middle and re-merge, and it has four layers of keymappings to keep the design compact. It will support custom keymaps as well. They're planning to release the firmware and design files under the GPLv3, and they're working on repair instructions, too.