For those of you who don't know what Epic 6 is...
http://www.myth-weavers.com/wiki/index.php/Epic_6I'm planning on running a slightly more down to earth sort of game, where the players are exceptional but never reach the whole "I just took twenty arrows to the chest and lost 1/10 of my health" heights of very high levels. After discovering the Epic 6 variant system for D&D 3.5 I decided I really like the look of it but I still much prefer Fantasy Craft to D&D. How do you think using Epic 6 for FantasyCraft would work? How would I have to change it to make it fit?
Hey there, welcome to the boards!
I'm going to go against the grain and say that Fantasy Craft is a really good fit for an Epic 6 campaign. While its true the game is constructed in such a way as to address some of the issues we see in bog-standard D&D (such as scaling levels on NPCs, and greater scaling attributes on the PCs), vitality does spiral up quickly and can push some games n the slog-fight cul-de-sac the author of Epic 6 is trying to address. For example, a tough Soldier can easily be rocking around 80 vitality even by 5th level - if you're not ready to address that, or the sort of GM who'd rather have goons with knives and no special feats or tricks still be a threat in small groups, something like Epic 6 might be the way for you.
It's a little-known fact that during the final stages of FC design, we decided that 6th level is the game's "sweet spot" - where the combination of feats, abilities, skills and tricks really put the heroes in good stead to take on the world. Ending upward progression there, while still allowing them feats to expanding their repertoire without increasing their numbers, would work pretty dang well. A 6th level character also tends to fill his sheet, so that's a good indicator

The fact that Fantasy Craft's feats are more akin to the kind of things that you'd see as class features in 3.5 makes me think that the players wouldn't feel like their characters weren't progressing even if their Saves and BaB weren't going up.
Exactly my thoughts, plus the added bonus that our feats have very few prerequisites at all - meaning by 6th level most characters should have access to nearly every feat in the game should they be inclined. Since we do have scaling monsters, gradually increasing the threat of monsters as the PCs build feats is not a problem at all.
At any rate, I think there's nothing "wrong" with playing an Epic 6 campaign using FC - in fact, I think the system's very accommodating to that style of play. I'd warn you that weapon mastery will make things dangerous for the heroes pretty quickly, and high level monsters and spellcasters will remain scary - but if you're playing Epic 6, it sounds like that's what you want anyway.
Good luck! I look forward to hearing about your campaign.