There should be no problems with using more power or generating more heat, there's nothing particularly special about hybrid body electronics. My friend and I just installed a fold-out screen with a computer for navigation and audio in his Prius, as well as a couple of big amps and a subwoofer. No problems at all, and considering how 'non-standard' the Prius is, there should be even less of a problem installing something into a Honda.
see this for pictures:
http://www.greenhybrid.com/discuss/i...rius.2558.html