If you are interested in the Heavy lift quad idea, there was a kickstarter project last year that seems to have a few of your design elements already included.
I guess the cargo capacity could be used for you alternator system…"
"Hey all,
Another noob question - I have just purchased the Pixhawk with Telemetry, basically everything in the picture above - expect the the battery warning shown on the lipo battery - I thought (havent used APM yet) that you could set the flight…"