After playing with this idea for a couple of hours, I've concluded that the reason there's not a guide for it is because it's not very useful. Your best options are generally the most common-- stack the best feature of one, maybe two classes on another class that you take most of your levels in. Yes, you can burn most of your feats on these ability combinations, but most of the abilities you get aren't that useful.
Suppose you decide to go mostly Monk. You can get half your favored enemy bonus on the DC of Stunning Fist attempts (but not extra favored enemies) and stack Ranger and Monk levels for Unarmed Strike damage, get +2 to Stunning Fist DCs delivered by Sneak Attack (but not extra sneak attack dice) and stack Rogue and Monk levels for Unarmed Strike damage, stack Paladin and Monk levels for Unarmed Strike and Smite Evil damage (but not extra Smite Evil attempts), stack Monk and Ninja levels for unarmed damage, ki pool, and ki strike (but not extra Sudden Strike damage or ki powers), and stack Monk and Sorcerer levels for AC, add Charisma to AC instead of Wisdom, and burn spells for unarmed strike attack and damage bonuses (but not caster level or spells). If you take mostly Monk levels, you get very few benefits beyond simply being a monk, lose about half your class features, and burn all your feats. If you take mostly levels in another class, you lose all the (admittedly weak) benefits you stacked onto Monk, meaning you wasted the levels you used to qualify for the combination feats.
You can also stack features on the Paladin or Ranger the same as the Monk, but it winds up about as helpful. (One of the most disappointing to me was Devoted Performer, which stacks for Smite Evil damage and Bardic Music uses-- I'd prefer the other way around.)
The best option I see is to combine Ascetic Rogue, Devoted Inquisitor, and Swift Ambusher. Paladin 2/Monk 2/Scout 3/Rogue 13 gets you Sneak Attack +8d6, 2d6 unarmed damage (easily boosted to 2d10 with a Monk's Belt), Skirmish +4d6/+4 (and the ability to qualify for Ambush feats as though you had Sneak Attack +12d6), Smite Evil 1/day at +4 damage that may daze the target if it's delivered on a sneak attack, and if you have Stunning Fist (6/day), +2 to the DC if it's delivered by sneak attack. You could give up two Rogue levels (or just drop Paladin) for Swashbuckler levels and get Daring Outlaw, but all you get is +2 on Reflex save and +2 (or +3) to AC against one opponent at a time, and your unarmed strike damage caps out at 2d8 even with a Monk's Belt unless you also get something else to boost your effective Monk level. If I were ever to try it in an actual game, I'd probably drop Paladin entirely and go for Monk 2/Scout 3/Rogue X with two combo feats, which is a sort of build you explicitly said you didn't want to see because it's already been done to death.
I admit, I'm just working with CAd and CS, since I don't have CoV, but you didn't seem to like the CoV Bard stacking that went on earlier, so I'm inclined to believe the idea isn't very optimized.
