Re: cutting my case??
You can use a dremel, or anything really that cuts metal (obviously). To attach the plexiglass most people around here use double sided industrial tape, seems to work the best overall.
Also, don't make so many topics. Search around and if you have to make one, lump your questions together.
My Current PC-
Intel Q6600 G0 |Western Digital 250gb HD
Seagate 500gb HD | Western Digital 500gb HD | VisionTek HD4870 | 4gb Cruical Ballistix Tracer DDR2 800
850w Thermaltake PSU | Cooler Master Centurian 590 | 2x Dell 22" LCD
-900HA EEE pc