I'm undertaking a unique quest - to mod an iMac G3 into a LAN party computer. When you think about it, this isn't such a crazy idea - an all-in-one with lots of space, that even comes with its own handle! My goal is to make it appear as original as possible on the outside, while making the innards much, much different. Here's an album of the dismantlement (I'm not sure if I can embed images on here, but if I can, please let me know)
I began with a (mostly) working iMac that I bought at a yard sale a few years ago. As cool as it was, it really couldn't do much other than browse the web. Its CRT was heavy and put strain on your eyes. I know there are people out there that will be upset that I destroyed this piece of history, but trust me, it'll all be worth it
I gutted out the internals, putting back together the metal casing and plastic shell. I ordered a 15" LCD to put in - those things are surprisingly rare nowadays! I'll be taking recommendations on what internals I should put in, and how I should arrange them. The way the case is set up, I was thinking of mounting a mini-ITX mobo upside down from the top of the case, and cutting out some of the bottom part of the metal casing (the part where the fan is now). This would allow me to have easy access to the innards (because the case is designed to be opened when the computer is upside down) for installing, upgrading, and troubleshooting.
As for the exact components, I was figuring that not much power would be necessary to for the 1024x768 display I could possibly get away with an Atom or AMD APU mobo/cpu combo, but I could end up regretting that later. Right now I'm split between a low-end Sandy Bridge build (i3 or Pentium), or a midrange AMD FX series CPU. I would probably start out with the integrated graphics to see how they do, and likely upgrade them later. I also plan on giving the build HDMI-out, so a little extra power wouldn't hurt.
I would think a dual core pentium or i3 paired with a GTX550 or Radeon 7750 should be more than capable enough for a 15" screen. I'm sure you can still get single slot graphics cards, not high-end but should still be powerful enough for your purposes.
I'm going to try to mount the monitor soon. It seems like it'll fit pretty snugly, I'll just have to whittle away at the plastic a bit. Any suggestions on how to keep it in there? I've heard of people using things like adhesive foam, but I don't have any, and I'm not sure how well that would work. I do have plenty of duct tape, however I don't want my whole project to rest on a couple strips of duct tape