| ladenedge |
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Regarding how much writing one can do with an ounce of ink, I can offer some rough calculations. First of all, it's completely variable on writing style and nib size, but one can expect somewhere in the neighborhood of 5-20 pages from a modern ink cartridge. Modern ink cartridges are generally filled with 1 mL of ink, and there are ~30 mL in an ounce. Because old-style fountain pens and jars of ink aren't nearly as efficient as modern ink pens, however, you can probably subtract at least 2-3 mL from a jar's potential. That means you'll get 135-500 pages from an ounce of ink. If it were me, I suppose I would ask the author to roll a d10+4 to determine her average pages/mL (per writing session?), multiply by ~27, then go with that.
For example, suppose your author rolls a 4 on her d10. That means she's getting [(4 + 4) * 27 =] 216 pages per bottle of ink.
Having said all that, as a dedicated author in my own game, I have to say that nearly all of the rules you've quoted seem a bit overly technical. While I don't see any reason they couldn't apply to Pathfinder (except for the Chronicler, who might require some customization), I would tend to agree with Cheapy that Profession (Scribe) might be worth looking at.
In addition to Profession (Scribe) being simpler, I happen to like how its mechanics automatically allow writing to be a royalty-oriented system not unlike what authors actually use today. That is, your character writes a single book, then makes her weekly Scribe rolls to determine her income regardless of whether she's actually written anything recently or not (since the book will presumably still be selling long after its completion).