7 pools...i was just there this past december. we witnessed a guy jumping from the road into the pool below, climb out of that pool and jump into the next. kept doing that until he was about where you are standing taking the picture.
as for my picture...
personally i used tin snips once. people thought i had made my circles by cutting a fork. really not a good idea unless you really know how to use thing things hehe. the hole saw is the best bet. just make sure you get one meant for metal and not wood :D.
some cases seem to have the motherboard compatibility listing as atx OR smaller. i would venture to say that would include mini-itx but not sure. an example is...http://www.newegg.com/app/ViewProductDesc.asp?description=11-156-021&depa=0