Nice, looks like we ended up with pretty much the same changes. I was just working from some photos, and yours works, so probably best to go with your values.
The only differences I can see are:
R5 - I went with the 510R from the datasheet. I think yours (430R) gives a slightly higher drive strength, probably good if using long cables.
R23 - I had 5k as the pull up from the datasheet, but your 4.7k only increase the drive current needed by a tiny amount.
R21 - I couldn't see the value in the photo of the Mac v5 board I had, so guessed based on the v4 mod. Only 50% out (I had 100R, you have 220R). Any idea what this one does?
Fuse - I went with 50mA based on that's the max that any connected DVI device is supposed to draw, but then the VESA spec apparently says that the host should limit the current between 50mA and 1A. I didn't know what the v5 could actually supply, so erred on the low side.
Couple of capacitors around the regulator - I just guessed based on the v4 mod, you'll have been able to actually measure them. The datasheet for the regulator doesn't say what should be used, and it won't be a high current load.
If you don't mind, I've a question about the HPD signal. I think that the v4 used the actual HPD signal from the connector, but that v5 uses the Monitor Sense signal on the Sii chip, which it generates based on detecting a load on the signal pins. So I'm not sure if any of the components on the HPD (R1, CR11, L505) are needed or not. Would you be willing to see if the board still works properly, particularly detecting if a monitor is plugged in, if those are removed?
Also, were you able to find a source for the PQ1R33 regulator? I couldn't find them, and the pinout is different from any regulators in that package that I could find.
[edit: forgot to say, interesting that 3dfx stuck with their 100R/10K pull down/up on most of the SII pins, when the datasheet gives 330R/33k]
[edit: oh, and feel free to take any of the diagrams if you think they'd be useful]