Also on that last flint holder piece, I think you've got some of the arcs and lines drawn in such a way that the line coming off the arc is not quite tangent to the arc but pretty close to it. That kind of very shallow angle between curves will tend to make problems with filleting later on - it is better when things that are within a few degrees of being tangent are built using snapping methods to make them precisely tangent instead of just almost tangent.

Basically, if things are sharp, that's ok, and if they are tangent that's ok, but it is a problem when they are in a kind of no-man's land of not tangent but within a couple degrees of being so.

- Michael