[gguruusa]

Like bonuts, I found most of the directions on how to set the paths somewhat incomplete/ambiguous. R2 should address the problem, but I found making Kolano's changes the easiest (least typing):
In CreateROM.bat

CALL ..\temp\HTC64_Extended_ROM_Tool.exe

changed to

REM CALL ..\temp\HTC64_Extended_ROM_Tool.exe 
CD ..\Temp 
CALL HTC64_Extended_ROM_Tool.exe

Then, the Extended ROM file filepath should be

• ..\upgrade\nk.nbf

The FAT16 file filepath should be

• ..\temp\nk.nba

or

• nk.nba

(either setting should work since temp is the current directory - I use ..\temp\nk.nba for consistency) [relative pathing works for me] If you save the project, you'll never have to make these changes again!

Push encode, acknowledge the "FAT16 is to large" error, and follow the remaining directions.

The only problems I've noticed so far are:
If you select O2 Plus, you have to uncheck

• (these load the same DLLs O2 Plus loads, leading to a file exists error when you build)
  O2 Calendar
  O2 Last Call
  O2 Running Programs

and you have to check

• (these load additional DLLs - if you don't select them, your PPC will lock up on it's initial boot)
  O2 Meters
  O2 Sound Profiles

[the easiest way to fix this is to copy o2Meters.dll and o2profile.dll into the optional_o2 directory - then you either select O2 Plus and get it all or you select the individual components.]
Additionally, o2opr.dll (for the divert option) is not present in the optional_O2 directory, so I imagine the Divert Profile in O2 options won't work so well.

VoiceCommand installation requires voicecmd.exe be copied into the appropriate Optional_Voice_Command... directory before you start building. [you can find directions on how to extract this file from a licensed copy elsewhere on the site]