A bit of clarification: Ten Thousand Bullets will be a Mastercraft core book, like Fantasy Craft except for street crime/noir. Like Fantasy Craft, it will be standalone. It will contain classes and other material that fit its genre and setting - some old, some new, some converted, some not. This is how all the Mastercraft core books will work - they will include whatever is (most) appropriate to what they're trying to accomplish. There isn't a set formula for this and we won't arbitrarily be including everything that might
fit just because we can (that way lies madness).
Remember, the only purely Mastercraft releases you'll see are ones that support all
(or at least most) of the core books - like the Dramatic Conflict products.
Hope that helps.