Alacrist - the instructions were largely easy to follow, with one or two very important exceptions. (Those pics came right off the site I bought mine from, so I'm pretty sure you're looking at the same brand I have.)
The chrome parts are just a wee bit thicker than the stock parts, so you'll notice a slightly different fit to the case - which means that you do have to kind of squeeze to get the screws straight in their respective holes, especially the last few at the system face. Also, the instructions didn't mention how much of a pain in the rear it was to get the LED pieces and the power/eject/reset/controller-sync buttons to sit straight while you got the faceplate back on. Finally, when the faceplate is assembled and ready to go on the completed case, there are a few black tabs that need to slide perfectly into place, which the instructions didn't mention, so when you slide it in, you have to apply a little pressure from the bottom while sliding in to get them to go all the way in.
But a little tip from someone who's taken apart every piece of video-game hardware he's ever owned: don't insist on getting it done too fast, or even all at once. Don't be afraid to admit you need an extra day or two to get the whole thing done. Even professional installers take a long time when they do their first ones. (I can whip apart my XBox in about three minutes, and have it back together in five - but this was the first time I opened my Wii, and it took nearly ten hours.) Have a nice, well-lit (not too well-lit or you'll blind yourself on the chrome!) area with all the right tools, and make sure you keep the screws in the right order, according to their steps. Tighten, but don't over-tighten - plastic molds and metal screws weren't meant to take too much pressure.
And I noticed that my records for the Everybody Votes channel were corrupted. I *think* it was because I unplugged the system during stand-by instead of shutting it down completely before turning it off, but I'm not entirely sure. Either way, you'll have to go through and re-set a lot of the local settings, because the chrome case even replaces the original battery-backup tray, which means that you'll be removing the battery backup. (Yeah, I didn't know it had a battery until that moment, either.) So try to make sure you do a full shut-down before you unplug and start the operation, just to see if you can save all those votes. I had to delete the whole channel, re-download, and then start a new profile before it was working properly again.
-Darque