That's a nice layout, very well done and it's nice to see that you let the kids get involved, very important theses days!
I noticed that you are using a Dell computer monitor that I assume has a direct composite input, so you don't need any type of converter. How does the system react with with other displays? The reason I ask is at one time I used an HP computer monitor with a direct composite input on it and as soon as the signal blipped the monitor would exaggerate the signal interference and seemed to take longer for it to recover than my 32" CRT TV. Not that you want to carry a 90 pound TV to each show!
Now when I used my composite to VGA converter with that same HP monitor it worked flawlessly.