Since you're not going for a replica Strat, I'd say that if you get a Strat body, trem bridge, top routed with a 3 single coil configuration, and you get an all maple neck or a maple and rosewood neck (or a combo that sounds similar to either one of those), then you will be in the ball park of having the Strat tone. If you were building a Strat that you wanted to be exactly like a classic Strat, then build it exactly like a classic Strat. It sounds like you're not too picky about it sounding exact, just similar. All this business of "it won't sound like a Strat unless you get a such and such finish" is ridiculous in my opinion. It'll sound like a Strat to 99% of people, it just might not sound exactly like a vintage style Strat.