I like Cascade skllls - so much so, that I might implement something like it myself. I already have experimented with multiple 'layers' of skills, ever since my own (unpublished) RPG back when.
The max. 4 skp in any given skill per CL is good sense. So is scaling Toughness. And skill focus redux. Not sure about the two-skill feats - not saying they're bad, but for some reason something doesn't look right. I'll think that one over sometime.
I've seen the same DR, Class Defence and Power Attack rules around a few places, and these all look sound to me.
The 'einhander' deal with finesse weapons troubles me a bit though - do you have feats to compensate for using this implied style of fighting (i.e., a one-handed weapon in the on-hand + nothing in the off-hand) ? I have added in a number of such feats; just wondering if you might've also, given that such a style is otherwise mechanically weaker than other options.
Sorry, I must've missed the rolling/other chargen system you use with these point-buy progression rules.. ?