nix-doom-emacs-unstraightened is a Nix-based build system for Doom Emacs that bypasses straight.el by using Doom's CLI to export dependencies and then building them with Nix's emacsWithPackages. It provides a flake, overlay, Home Manager module, and a set of Nix expressions to build a fully reproducible Doom Emacs configuration with all dependencies pinned via Nix. The architecture consists of multiple steps: extracting package requirements from Doom via a Elisp script, applying Doom's pins to emacs-overlay packages, handling missing packages with IFD-based dependency detection, generating a Doom profile and profile loader, and finally wrapping the Emacs binary. The project features extensive CI/CD, automated daily flake updates, and a Cachix cache. It demonstrates sophisticated Nix patterns including IFD, fetchTree, structured overrides, and Emacs Lisp scripting within Nix builds.