Just one check: 12 levels are available, that means both classes may be 12th level, right? I mean, this IS gestalt idea that there are two or more classes about same level?
I'd play human marshal/fighter, knowledge (administration, military tactics, siege etc), leadership, type for createing in dangerous new colony one defensible position for starters...he would also be in charge of town militia, training new recruits etc.
For a dwarf idea (if not taken): ranger/barbarian (or fighter) - scouting primarily potential mines and such for threats, but taking hand in forest recoinassance with other scouts from the colony...also assisting in training of militia (if humans can be persuaded to take orders) and provide critical knowledge in arhitecture, fort making, mechanic (for repairing siege) ...
That is, if I can make it...I'll know at the end of month when I'll know new deadlines for several projects