Setting up a remote camera rig

I couldn't find a particular thread that matched exactly what I was looking for here, but this one closely matches what I do. I'm working on capturing the remaining shuttle launches and then the new Constellation missions that will come after the shuttle retires. Because I'm doing this on my own, I likely won't be allowed to hardwire any of my cameras into a power source or a video feed and will have to have a remote setup to capture the video from areas close to the launch pad. I'll refer to the launches as the 'event'.

I'm looking for a practical way to set up a remote video rig 12-24 hours before an event and having it either trigger during the event, or start recording at a specific time.

Two things I've already thought of is to have a sound trigger start the camera recording when the event takes place. This is ideal and would use the smallest setup. If it's something possible anyways.

My other thought is to bring a laptop computer and a power source to the remote location and have it direct capture to the hard drive for the entire 12-24 hour period.

Has anyone had any experience in this or know where I can be directed to find out a reasonable solution? My cameras are Sony FX1's.

Thanks!

Chris
HD Videographer