I can help here as I helped build up his concept.
He wants use either a metamagic specialist variant from PHB II for sorcerer. Or simply and plain; gain bonus feat instead familiar. The bonus feat would be eschew materials (which I find weird is not included in core consider sorcerers learn cast spells spontaneously and many spells need miscellaneous components).
He wants go to Enligthened Fist, which is PrC found in Complete Arcane pg34. He meets reguirements to enter to it in 8th level (basically needs cast 3th level spells). Reason for two monk levels is for stunning fist and improved unarmed strike what PrC asks (and combat casting).
He also plans use Decisive Strike variant of the monk from PHB II. Sacrifice flurry class feature to use full round action to do single unarmed attack which does double dmg and increase stunning fist attack save DC by +2. He aims to be monk who casts true strike and tumbles near foe, then he charges 'one round' to perform mega powerful attack. Fun part; if foe is evil his smite evil dmg is also doubled in decisive strike (so +12 pts more dmg to foe).
The feat what he talks about is in Complete Aventurer in pg105. Also my bad Aether, the reguirements are easy and you can take the feat in 6th level
. Anycase feat regs are improved unarmed strike and able cast 2th level spells. It gives ability sacrifice a spell slot (as swift action) to add +X to attack and dmg rolls, the X value is egual to level of the spell sacrificed and bonus lasts for 1 round. Also it makes monk and sorcerer levels stack for AC bonus (so monk 2/sorcerer 4 have +1 bonus to AC from class levels). Also you add Cha mod to AC instead Wis if you so prefer. Also allowing multiclass freely between monk and sorcerer.
Anycase the paladin mount variant he speaks of is in Dragon Magic pg13 and mount stats in pg113. Variant is called 'Drakkensteed Mount'. Pic of the mount is in below (only thing what he looses is that his drakkensteed cannot speak with animals of it's kind);
Always N, Large animal (dragonblood)Init:
Low-Light Vision, Listen+6, Spot +5AC:
15, touch 11, flat-footed 13 (-1 size, +2 Dex, +4 natural armor)HP:
30 (4 HD)Fort
50'ft, Fly 60'ft (poor)Melee:
Bite +8 (1d8+6)Space:
Str 23, Dex 15, Con 19, Int 2, Wis 14, Cha 12Feats:
Listen+6, Spot+5Trample (Ex):
As a fullround action, a drakkensteed can move up to 100'ft and literally run over medium or smaller creatures. Dealing 1d6+9 points bludgeoning damage (reflex save DC 19) to each target. Read MM pg316 for details.
Some info: Drakkensteeds are mix of a horse and dragons, they are very skittish animals which are very rarely seen in the world. But as mounts they are outright brave; daring bite any sized foe who dares come close harm their riders. They have natural regal and graceful appearance and paladin mounted version of Drakkensteeds are legendary beasts which rare few can ever ride. Paladins who rever dragons or worship draconic deities can get Drakkensteed.