LED board

noagname

I want to create a little board with 20 LEDs. My only problem is wiring them, I want to make a parallel circuit. I was wondering if I could have a bunch of them in a line and have a thin strip of metal going over all of them. In the end have 2 metal strips one for positive and one for negative. If that does work will i lose any power like bumper carts. Like this Image, black being the metal strip, green being the LED, Blue being the wire
[img=http://img247.imageshack.us/img247/2300/ledpd6.th.png]