Basically what AC said - actually seeing the rules has cleared up most if not all of the questions I had, which was really all that I had truly wanted.  Pretty much all of it is fairly straightforward (all the underscore naming has me remembering the various programming courses I've taken).  About the only thing that I might question is whether or not it might already be a bit rules-heavy.<br/><br/>One thought I had was possibly changing the Offence v Defense roll into something like a Parry defense as opposed to the Evasion defense, which is basically just straight dodging.  You'd probably need to declare which would be used (perhaps as a default assumption), and it would both lessen the potential 'Agility is god stat' issue with it factoring into so many rolls along with giving a few more options for certain weapons and/or fighting styles favoring one over the other (you're not usually going to want to try to parry a big warhammer, for example).<br/><br/>Of course it really depends on how far in-depth you want to go with the rules; like I mentioned earlier, it might even be a bit far into that territory already.  I know from having done several projects like this in the past that the hardest thing to do is to decide when to stop, because it's so easy to keep going 'Well, I'll just add this one extra little bit' and then suddenly it's three times as long - the VSRD that I did for Pathfinder is a great example of this as it adds over 50 new feats, and that's with me stripping out or combining quite a few already.  I'm still not entirely happy about that, but there isn't much way around it with how Pathfinder works.