Don't forget to figure in the cost of a few tools,
which you would need eventually anyway.
I agree that your estimats are a tad bit optomistic. I recently completed a build with an inexpensive frame ( Fetish Cycles SAC ) and ended up spending a little over twice what you quote. Yeah, I used new components...could've gone used and saved some cash but I'm VERY HAPPY with the results. Plus I know what makes it tick, so to speak. Would I do it again...you betcha. In fact, I'm waiting for the big brown truck to bring my lugged steel Bianchi frame so I can get started all over again. This one will be more "retro" than performance orientated.
Wayne