Need help with component run

Greetings all. I recently purchased an old home that I had some lines ran in for my 720p projector setup. The projector is aprox 45 feet from the source. Due to time constraints, my electrician ran 3 standard cable coax lines and placed RCA type adapters on the ends in order to make what he called a custom component cable. I have already watched a standard 480p dvd and can see signal degradation in the color and sharpness from my previous setup with a 25' component run. He also ran a Cat 5 line. My question is, what would be the best way to get the best possible 720p/480p signal out of this run? Should I just purchase a long enough component cable and rerun it? Or should I try to run the signal over the Cat 5 cable and use some sort of adapter. Any help would be greatly appreciated.