Castillonroy is the first Super Grub Disk design that was used before the actual use of svn. It is described here: SGDDevCastillonroyDesign. It's main lack is that Grub legacy source code is being modified without the use of any patch file.
Similar to Castillonroy series but using patch files. Not implemented yet.
SGD is redesigned to be compiled with Makefiles and C programs.
SGD is based in Grub2.