I've actually been looking into and have found numerous plans for building both solar paneling and wind turbines, wind being the cheaper option @ 1 generator for $150.That's what we use to run the show. Your biggest issues are batteries and what voltage you require. have a look around at places like otherpower.com for ideas on diy systems, you might just be surprised on how little of an investment you really need to make to have it all work out.
We have not gone the diy route just yet, but Southwest for the wind portion and a numb er of 180 watt solar panels for those few days of low wind.
The batteries are actually what worry me, assuming I need just the one Inverter. I'm totally clueless as to how many or exactly what ones I need to start searching for. As far as I know now I need the Deep Cycle ones they have at Canadian Tire.