Having just finished an SG I would also recommend using a band saw for the rough body work, then using a router template. You have two types of alternatives for shaping the body. If you want to invest in the right tools you can use rasps, files and spokeshaves/planes to shape the contours. Or, if you're strapped for cash, you can just get a cheap drum sander that fits into your power drill, if you get a big enough one shaping the inside horns is really easy. the outside contours are a bit harder, you have to apply steady pressure, taking little bits off at a time and moving over the whole curve at once. If you sit in one spot for too long you'll find that you have a depression and you'll have to sand the rest of the curve to match it. I recommend getting the propper tools to do the outside, but I have done it with a drum sander on the outside, and it's actually what I prefer on the inside because I get a smooth, even contour.