I have been working on a D12 system for years. The full thing with classes, subclasses, spell lists, monster lists, etc to fit in a big 8.5x11 sourcebook. As an exercise I tried to distill it and my design philosophy to its pure essentials. In doing so I have reduced it to a double sided 11x17 folded into a booklet. I am debating adding some sample archetypes of different genres to inspire the players, but I worry that it will reduce their creativity leaning on my work instead of creating their own.