First, welcome to the site. There are other folks on this forum who have undertaken the challenges you're facing, so be sure to solicit their experience.
Second, the '04-'05 headlights had an issue with the DRL lenses "crazing" from heat. There are several posts on that on this site, including the wiring change (jumper cable) you'll need in order to upgrade to the '06+ lights, where the crazing issue was fixed.
As to the pic', it looks like there's a skylight in the roof, so God can watch you working on the XLR.
Tim
(Former Cowboy fan)