RE: necessary tools for scratch building ...
I have a Dremel scroll saw that I love and a Craftsman band saw that I hate. I could seriously use a belt/disk sander, but I haven't gotten around to getting one yet. For the hobyist, you might want to also consider Ryobi brand tools. They are pretty decent quality and reasonably priced. You might also want to consider a drill press too. But more important than any of that is a good set of knives, straight edges, sanding bars, clamps, and a Dremel rotary tool.