How to modify a media controllre skin?

This is the old skins format. It have some restrictions. One of the restrictions - all controls must exists. I recommend to use the new skin format. The description is here. If you assistance let me know. Or post the images and the picture of the result you want to get here. I can make the skin for you.

Is there a similar description for system monitor?

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I was looking to modify the "Terminal" skin so that it just shows four vertical CPU meters transparently (or with a background matching Aero Glass). Can't be too difficult, I thought. :-) Everything I need is already there, just need to remove the memory bars, and maybe change the colours.