The build process for tor-ramdisk stabilized as of the 20080606 release, and so there is no reason to continue buidling manually as documented in Tor-ramdisk from scratch. All of the script fragments were collected into one build script which can be obtained from the scripts directory in the repository.
Download build.sh to a hardened UCLIBC based Linux system. The Embedded Gentoo project provides one:
<any gentoo mirror>/experimental/x86/embedded/stages/
Then, as root, do
chmod 755 build.sh
./build.sh
After the script is done running, the ISO for tor-ramdisk will be found at
release/tor.iso
relative to the directory where you executed build.sh
Here's what the script does: