I'll add to this more later, but I believe that a two-handed fighting Warforged Fighter/Kensai could have some very strong synergy.

Kensai have all of the benefits of adding special effects to glancing blows and they get many extra bonuses to hit.

Warforged get a whole line of tactics enhancements and Power Attack fits in extremely well with the Kensei's damage potential with a two-handed weapon.

Kensai saving throws complement warforged immunities very well.

Essentially you could build Ghoste's light infantry tactical fighter as a pure fighter and make room for all of hte Kensai goodness.

I'll try posting a theoretical build later, but this looks very promising for warforged 2-hand fighters.