Ok, thank you all for the helpful tips; I guess I'm going to need to lay down some sheets of wood or something - the area of the roof where the panels is going, underneath it inside there are only lots of support beams and insulation. No attic to speak of. We have an excuse for an attic in the garage - a bunch of sheets of thick plywood laying on top of the support beams. Nothing like that over the rest of the house though. Guess I'll have to make a few temporary additions there.
All the above comments about sealing are on the ball, the 'roof truss' method is the strongest, an alternative (which is better for your trusses in case you do have a bit if seepage) is to bolt a 2x2 on the side of your roof trusses, and then mount your hardware in there. That way if you do have a leak that which gets eaten is expendable.
So this is if I mount to a roof truss, then I just put reinforcements on the sides, correct? The drilling in this case would be done from the rooftop I assume?
I hope you can scrounge up some on-site assistance from somebody who has done it before.
I imagine I can find someone to give me a little help on this. I'll only be doing solar power too - no windmills. The windflow around the house is very turbulent - we get horizontal vortexes forming everywhere, as the wind sweeps down low to the ground until it hits the house, blasts upward until it comes to the roof edge, and then blows away and down to the ground. The entire house gets a strong downdraft too - our chimney is useless. A match placed in front of the air outlet in the basement gets blown out forcefully by the air blowing into the house. Hm, maybe a windmill in the chimney? 
