I could do it, but my main problems with that are I don't have a huge amount of time to do massive architecture of files, and I also have alot of work to do on my own game that has some homebrew stuff that is distinctly different than they are in 3.5. Another thing is, I have a completely different way of constructing the files from the way Aaron did them, like standardizing some of the Specials so that I didn't have to make whole new constructs of them (i.e. standardization speeds up the creation process). I'll take a deeper look at what Lawful_g/Aaron had done and see if I can keep with his process, and I may be able to, at the very least, take a stab at it.
Ok, I took a look at the d20 stuff, and I have to say, it's far more complex than anything I have done. There are a myriad of tags that I've had to track down, as well as a number of abilities, etc. that are spread out among the individual user files. By contrast, after all the work I've done, I've only had to make 7 total tags thus far.
One of the things that confused me, is the stuff that has been coded within the Render Phase. What is the Render Phase, what does it do, and why there (these were damage tags for types and damages).
I do commend the work that has been done, I've looked at a couple of things that are much better than what I have come up with (Ability Drain/Damage for example), so I'm going to take a closer look at those things. There are many things that I found that could be streamlined, or made less complex (at least at first lookover), but because I don't know all the interconnected stuff from the various user files, I'm not sure I'm seeing the whole picture. But I digress.
What this comes down to, is that I would love to work on the d20 files, but that I'm not sure what everything is doing yet. Furthermore, I'm not sure I would use the same methods on some abilities as the files currently have (though I wouldn't change what's already in the files), so I'm worried about compatibility down the line. Is there anyone that had documented the files, what each tag is doing, what each ability is referencing, etc? That would be a big help towards understanding it all without having to search multiple user files.
And, of course, once I decide to try to do this, I'll need goals, things that need to get done. That's about all I can do at the moment, but I do intend to try to finish the d20 files (insofar as they can be).