Allowable Sources
 

I've found Bariaurs on pages 166/167 of Book of Exalted Deeds including Bariaurs as Player characters. If you'll allow it?

Bariaurs possess the following racial traits.

• +4 Strength, +2 Constitution, –2 Charisma
• Large size. –1 penalty to Armor Class, –1 penalty on attack rolls, –4 penalty on Hide checks, +4 bonus on grapple checks, lifting and carrying limits double those of Medium characters.
• Space/Reach: 10 feet/10 feet.
• A bariaur’s base land speed is 40 feet. Its speed drops to 30 feet when wearing medium or heavy armor.
• Quadruped: As quadrupeds, bariaurs gain a +4 bonus on checks to resist bull rush and trip attacks. They have a carrying capacity 1 1/2 times greater than normal for their Strength. They must wear barding instead of normal armor (see the Armor for Unusual Creatures sidebar in Chapter 7: Equipment of the Player’s Handbook) and cannot wear boots designed for humanoids
• Darkvision out to 60 feet.
• Racial Hit Dice: A bariaur begins with three levels of outsider, which provide 3d8 Hit Dice, a base attack bonus of +3, and base saving throw bonuses of Fort +3, Ref +3, and Will +3.
• Racial Skills: A bariaur’s outsider levels give it skill points equal to 6 × (8 + Int modifier). Its class skills are Handle Animal,
• Hide, Jump, Listen, Move Silently, Sense Motive, Spot, and Survival.
• A bariaur’s outsider levels give it two feats.
• Skill Bonuses: Bariaurs have keen senses and gain a +2 racial bonus on Listen and Spot checks.
• Automatic Languages: Celestial and Common.
• Favored Class: Ranger.
• Level adjustment +2.

You realise this + the level adjustment puts you at ECL 5 before you've even taken a single class level right?

Meh! It's role play for a reason and three monster levels aren't that different from three ranger levels. Its not as if I'm losing out on caster levels or anything if I stick to fighter classes.

Is that a yes?

Sure- go for it. :)