I think the easiest way a non-carpenter type person can do this is with some simple right angle brackets. Go to the hardware store and ask where you can find right angle brackets. They come in a wide variety of sizes, both metal and plastic. Just use your head for what size you think you need. To be honest, I don't think there's a wrong answer since the shelves are pretty small. Usually you can find right angle brackets with matching screws. If get brackets without screws, just get some appropriate size wood screws. The size of the screw isn't crucial, just make sure they're not too big to fit the hole of the brackets, not too small to just pass right through the hole, and not too long for the material you're using for the shelf.
As for what material to use for the shelf itself, there's a number of options. Since that shelf is wood grain (faux or not) I would probably use pine and stain it something close to match. Measure what length and width you need for the shelf. Then find a piece of pine whose width fits on of those dimensions. Then just calculate how many pieces you can cut from the total length of the pine. That'll determine how many pieces you need to buy.
You can buy composite stock that's already finished with faux wood grain, saving you the step of staining it. But keep in mind that if you cut it into shelves then you will have unfinished edges that you can't just stain. This'll also be true if you wanna use some kind of particle board. Pine and small amount of stain would probably be cheaper anyway (at least in the US this is true).
Plywood would never bow or warp, but it'll also have an unfinished edge that you'd have to be more of a carpenter type person to deal with.
I don't know what your skill level is, so I don't mean to be condescending... At the very least you will need a circular saw, a small level, a drill (be sure to pre-drill all the holes for the screws!), and a little elbow grease. A t-square or speed square would get you better results for marking the cuts. You could probably get away with using a jig saw instead of a circular saw, but the cut would be a lot rougher. If you can get a piece of pine with a width that matches the depth of the shelf you need, then you only need to make cuts for the length of the shelves. If this is the case, the factory edge of the pine will always be front facing, which will look nice. So even if your cuts are rough, they'll be kinda hidden.
Pine is really soft, though. You can pretty easily mark it up if you're constantly sliding things in and out of the shelves. Me personally, I wouldn't even worry about it. But if you wanted to go the extra mile, you can put some kind of clear coat over the stain for protections. Like polyurethane. Or, of course, spray them black instead of staining, and then build up a finish.
samsonlonghair wrote:Don’t be terribly alarmed if Ziggy tells you to throw out your ikea shelf and build something nice from scratch.
Heh. From what I've seen, Ikea furniture isn't very rigid. It isn't hard to build something more sturdy than Ikea. But it's not like I've built all my own furniture. I have plenty of cheap knock-down stuff that I had to either repair or modify to strengthen. That darker shelf is holding two CRTs, so it can't be THAT bad.
