Chun-tzu said:
Fighter's BAB is nice, but combined with the spellcaster levels you needed to qualify, you're still a few points short of a dedicated warrior. You probably won't be wearing armor, and will need magic items and spells to boost AC, and you don't have the hit points to stay too long in combat.
That's my feeling as well. Considering how a lot of buffing spells now have reduced durations, this class might struggle in many combats. Hitpoints are mainly a mix of d4 and d6, so high AC is vital, but I can't see how you're going to get it.
I really like the idea of fighting wizards. I just don't think this is quite what I had in mind.