Your project is good, but the reason why you've received quite a bit of skepticism is that you didn't tell is why your project is important and useful. I believe that with this technology, we can get to know a person physically, but I doubt if it's adequate to know a person for who he is. It is very possible for a person to fake his character and emotions when he knows his data will be stored for future generations.
This is exactly why we need this PreANN topic, to show the basic idea and collect feedback on it and on our presentation of it. So thanks!
Now to your questions. Why is it useful? Well, until we get the real immortality, digital one is the next best thing. And it is also like a plan B, just in case. Or a plan C after Cryonics. It is better to save yourself at least in detailed digital form, than not to do this at all.
Can a person fake his character? Yes, indeed, but that's his own choice. He may want to store the "real" self, as close to actual personality as possible, or he may decide to adjust some stuff, to "forget" what he doesn't want to remember and so on. Yes, this kind of kills the idea but everyone should be free to choose for themselves.