How are you going to increase your dmg? I mean, if you want to build ubercharger (power attack, shock trooper) you are delaying that past lvl10. Imho I would squeeze in a lvl of martial adept class and use the feats for something else (e.g. PA & ST).

Note that as a role-playing gish as you described it, you'll be bad at both things. Spells due to the lack of metamagic, and melee since you won't deal any noteable dmg. Do you intend to do only weapon dmg + Str mod till 20 without buffs?

Imho your definition of "gish" sounds more like a "jack-of-all-trades, master on none". And if that is your intention, there are better options to solve this. Maybe have a look a the chameleon prc. Since it doesn't need any casting base class you could use martial adept classes to enter Chameleon.