On this vid, at the beginning ~ 0:42, you can see the light bar.
It's a piece of steel that I cut to size, drilled 42 holes for the leds, grinded a diamond plate kinda pattern on prior to bonding my 7 CREE RGB's. I then used frosted mini-bulb covers to cover them. It's a PIA, but it's very rewarding.
BTW, In Brad's VPCab last picture directly above this post, you can see his light bar as well. His cab features a 39" recessed monitor, and doesn't have a frame matte, which is a perfect example of nicer looking individually. The con to it, is it'll look a bit smaller than a real pin. IMO, that's OK, just figured it'll be better to be informed. Just like my vid, I was initially disappointed by alpha-numeric games on my DMD ~ 13:00. It just took a minute to warm up to it.
Oh yeah, in another plug for VPcabs, his backbox is nicer looking than any of the other commercial builders that I've seen.
I custom made my backbox for a 32", and it's about 2" wider than a standard backbox. IMO, it looks good since it's on the widebody cab. People usually forget than widebody's have standard backboxes, so most people wouldn't even have noticed, since it's overhang is actually less than a standard body.