Fantasy Class Blending Rules (for Pathfinder)
A recent message board thread reminded me of a project I started a while back… (but I then shelved it for other things like the DungeonMorph Dice.)
The core concept is to break down each Pathfinder class’s abilities and assign them point values so you can build back up your own custom class. (The 2nd edition AD&D DM’s Guide had a similar system.) It is designed to be a better way to multi-class. When you multiclass using the core rules you either have a character that is very weak in one class (because you only put a level or two into it) or else the character becomes below average at everything (if you split the class levels roughly evenly.) It is also designed as a guide. You’ll want your GM or a fellow GM to sanity check the results.
Class archetypes (a later Pathfinder concept) lessen the need for this system, but the system can help to build and balance new archetypes. Or perhaps you really do just want to build a new class.
Anyway, it is still very much a work in progress, but the point values for all common things (Hit Die type, Base Attack Bonus Chart, etc.) and all the Core Rulebook class abilities are in the document. Example class blends are also included. Let me know if I should take it further (formatting, include abilities from more classes, write more introduction and instructional text, etc.
Link to the Fantasy Class Blending Rules.

I like this, but I would limit this to one customized class per person. Allowing multiclasses between two customized classes makes it really easy to cherry pick class features. It’s easy to build a class with lots of low level features and dip into it for a quick boost.
I’d be interested in seeing your breakdowns for the other base classes.