I'm thinking of a setting that is based on the Gestalt concepts of the unearthed Arcana. However with a few stipulations.
1. One of your classes must be Cleric, Fighter, Rogue, Wizard.
2. One of your classes must be Alchemist, cavalier, Inquisitor, Magus, Oracle, Summoner, Witch.
I've intentional left out Bard, Druid, Monk, Paladin, Ranger, Sorcerer. The reasoning is that those classes seem to be to be bluring the lines between two or three classes already. Except the Sorcerer.
This provides the following combinations
Cleric/Alchemist, Cleric/Cavalier, Cleric/Inquisitor, Cleric/magus, Cleric/Oracle, Cleric/Summoner, Cleric/Witch
Fighter/Alchemist, Fighter/Cavalier, Fighter/Inquisitor, Fighter/magus, Fighter/Oracle, Fighter/Summoner, Fighter/Witch
Rogue/Alchemist, Rogue/Cavalier, Rogue/Inquisitor, Rogue/magus, Rogue/Oracle, Rogue/Summoner, Rogue/Witch
Wizard/Alchemist, Wizard/Cavalier, Wizard/Inquisitor, Wizard/magus, Wizard/Oracle, Wizard/Summoner, Wizard/Witch
Which gives the players a setting with 28 character classes. However I'm concerned that some of the combinations may not be that good of a fit thematically, while some may be way too powerful (and I know it's Gestalt, that should say something).
Classes out of this that could be not worth having. The goal here is to create a nice variety of Gestalt Classes that have a solid theme and good mechanics. Once I have a solid list, I do plan on doing some minor tweaks in order to assist the mechanics. Like the Fighter/magus might get Armored Casting a little earlier, any where powers or abilities are duplicated I would want to enhance the class to have a more natural feeling.
Got any Ideas.