I think I'm going to change things totally and go with something like this:
Mecha-gishzillaMagic-blooded Dragonborn Warforged Duskblade5/Spellsword 1/Suel Arcanamach 1/Abjurant Champion 5 (not necessarily in that order)
I haven't planned the rest of the build out, but I definitely want to keep progressing Suel casting and BAB. I'll probably go with 3 more SA, and then back into Spellsword. It could end with lots of stuff, though, including 4 levels of Dragon Disciple, which would be interesting and flavorful. Or Spellcarved Solider.
Dragonborn is technically a race, not a template, so I don't have two templates (which is not allowed in the campaign)... It also gets rid of the standard warforged body without burning a feat on unarmored body. I'll pick the breath weapon, and take the feat Entangling Exhalation for a crowd control ability.
Magic-blooded (DM ok'd this) is just to keep from totally tanking Cha, which he'll be using with Suel Arcanamach to cast spells. An Int of 12 and Cha of 12 should be plenty to start with. I can put leveling points into Cha and get an item later, to eventually get to 20 for 5th level bonus spells. I might just ditch all the fear effects entirely. Mostly I'll be using spells that don't allow/require saves (like buffs), so I don't need super high casting stats.
There are sooooo many good feat options for this, it will be hard choosing them.
ACF: the alternative class feature Skilled City Dweller from
the Cityscape WE lets you trade ride for tumble
Feats: Entangling Exhalation, Dragon Wings, Improved Dragon Wings, Power Attack, Combat Casting (Bonus), (Arcane Strike?), Versatile Spellcaster, Iron Will, (Knowledge Devotion?), (Smiting Spell?), (Quicken Breath?), (Practiced Spellcaster?)
Equipment (wish list): Cloak of Charisma +X, guisarme, breastplate (mithril twilight fullplate of speed), Sudden Stunning weapon, Drake Helm (spells known, Explorers Handbook), Ring of Theurgy (spells known, CA), Gloves of the Starry Sky (Magic Missile, MIC 204), Belt of the Wide Earth (Teleport, MIC 204), Periapt of the Sullen Sea (Freedom of Movement, MIC 205), Knowstones (DR 333, add to spells known, priced as pearls of power, must be on spell list I think), Anklet of Translocation (MIC, swift action teleport 2/day, 1400 gp)
Benefits: Quick Cast 1/day, Channel Spell (Duskblade, Std Action), Armored Casting (medium), lots of spontaneous spells from two lists
Drawbacks: Two casting stats, so a bit of MAD, mitigated by the fact that he'll mostly use buffs.
Build options: Sandshaper, Fiendblooded, Dragon Disciple, more Spellsword, Wyrm Wizard, Silver Pyromancer, Dracolexi, Sand Shaper, other.
Starting stats (32 PB, with racial mods, and +1 Cha at level 4):
Str 14
Dex 12
Con 18
Int 14
Wis 6
Cha 16
Progression:1 Duskblade1 Entangling Exhalation (flaw), Dragon Wings (1), [Armored Casting, light]
2 DB2 Combat Casting (bonus)
3 DB3 Iron Will, [Arcane Channeling]
4 DB4 [Armored Casting, medium], +1 Cha
5 DB 5 [Quickcast 1/day][2nd level DB spells]
6 Spellsword1 Improved Dragon Wings, [-10% ASF]
7 Suel Arc 1 [-15% ASF]
8 Abj Champ1 [2nd level SA spells], +1 Cha
9 AC2 Versatile Spellcasting, [Quickened Abjurations]
10 AC3 [3rd level SA spells]
11 AC4
12 AC5 Quicken Breath, [4th level SA spells][Martial Arcanist: SA],+1 Cha
13 SA2
14 SA3 [5th level SA spells]
15+ ?