Warning: this advice comes from reading, not from experience.
Well, the distance from your nut to your bridge is only 24.75" or so, so 30" should do you, although some blanks are a bit longer. 2" is pretty thick compared to a Strat-style blank, which is about 7/8"; however, without doing the math, it's possible that you'll still end up needing to do a scarf joint for the headstock. No problem, it's stronger that way anyhow. If you're doing a mortise and tenon, you may need to build up the heel area a bit, which means that you'll be cutting into that 30" of length a bit, which could lead you into wood shortage territory.
The best thing you can do is draw up a diagram. It'll answer all those questions you have.
Greg