I used quite a few books. Not all of these were actually used but I looked through all of the completes, the BoED &BoVD, ELH, XPH, fiend folio, frostburn, sandstorm, stormwrack, libris morthis, manual of the planes, all of the monster manuals, the planar handbook, the spell compendium, the player's guide to Faerun, and a lot of others.
A few suggestions for modifying the build are: drop Natural Cunning, Carapace, Repel Missiles, abomination traits, virtual class features (if your DM won't allow it), implacable hunt, faultless hunt, and seen it before from my build since you can't take as many monster abilities or class features. Also, make sure to check what is allowed and drop anything that is not allowed before you do anything else.
If you look through the last 10 or so pages of that thread you should see a lot of different things where were rejected (cough Alaex cough). You may want to see if your DM would allow them.
This build is spellcaster and includes class features from incantrix and archmage. You really can add anything to this build, just drop something that won't be as helpful.
Another recommendation is that a lot of things are not that good at this level of epic play. Anything that can be replicated by a spell or adds a flat value to a statistic just isn't worth getting.