Thanks for the thread. However, I think picking the base sets is probably pretty straightforward. What looks challenging is managing the rest of the game. I'm on the hook as the GM for developing all of the things a PC might need on their character sheet (SFX), of which none are playtested (I'm just guessing that they're not over or underpowered). Also, for every non NPC thing (monster, npc), I have to completely develop everything from scratch, again not playtested. So unless I'm missing something it seems like the game (1) is a ton of work for the GM and (2) requires a lot of skill and system knowledge. This isn't a criticism of Cortex, I played and loved firefly.