This may not be what you want to hear, but to be brutally honest, unless you can do a LOT of the work yourself, it is going to probably be a good bit cheaper to buy a high-quality accuracy guaranteed rifle new from a reputable manufacturer than to piece one together from scratch. Unless you have a donor action sitting around the house now, that is where you need to start. Custom barrels, gunsmith work, custom stocks, bedding, floating, etc., etc. really start to add up.
My intention here is not to discourage you from your dream, but to help make you aware of the serious costs involved in a project such as this. I love a beautiful piece of figured wood on a quality rifle, but the fitting up involved is a lot more comlicated and tedious than most people realize, but it just looks sooooo much better than synthetic. At least to me........ Just my $.02.......