Hi, no plan to fully open Source it , since is too stupid, and anyone can make it, the difficult part is understanding the edk2 build system
The only thing that It basically does is find and uninstall the BIOS provided DisplayEngine and Formbrowser, and then proceed to load the edk2 one (built straight from edk2 source, no mod), that allow to browse exported hii database (all amd module always export the HII database, so for this is called AMD form Browser, but also some intel bios does, and will work also there)
All you need to undestand all this is a read of the uefi spec
Basically this is what the Loader does, you just need to figure out from the spec, how Uninstall and how load a new image
