Scaffolded together UNTESTED json defs for another Scott Manley mod pack, putting these together made me realize that A, supporting a million packing layouts sucks, and B, Moving twoard a more procedural 'build instruction' set that can use optional variables, and providing a handle to set thosue otpion vairables (eg in a UI) is probably desirable over creating N**M package installation options as package defitinations get increasaingly complex