Very neat and clean template - All you need is to add more contents that are Search Engine Optimized. Best of luck!
I don't think so. There are many popular bloggers that have done it and there are many websites showing you how to do it with a simple code string. In fact, if you download any template from internet, then I'm shure that they have already included that string to hide the top blogger header. (99/100 times atleast) But hey, if you find it in the T.O.S and wan't to be 100% safe then don't do it.