1. What 'parts' are there of you? What are the 'elements of your nature'?
I can't completely distance myself from any object, because the moment something falls under my gaze, it has already taken on a personal significance, by necessity.
2. How are you and your body related?
Because the self in its essence is the fact of transcendence, and because transcendence is the antithesis of existence, the self only exists insofar as it's hinted at by everything in the world. That which proves the existence of the self most directly is the body as an object; and that which is the self itself is the body as a flow of freedom that takes up the objective body as the tool it needs to express itself. Put simply, the body is a mirror by which the self sees itself, and this image of the self is the only self that the self has, although the self, as a perpetual transcendence, immediately senses a truer self behind whatever self it has.
a. Could you exist without your body or without any body at all?
No, for the reason mentioned above: the body is the foundation of my existence, and without it--nothing can be said of that scenario, because it's nonsensical.
b. Does your body have any impact on your consciousness and does your mental state have any impact on your body?
It isn't so much that they have an impact on one another as it is that they're intrinsically bound and largely indistinguishable.
Yes, if by my body you mean both my physical and transcendental one.
3. What is it that is you?
See above.
4. Have you had another life before you were born? (ie, you, what you are, your very self)
"Another life" requires a "this life" to define, suffuse, and take priority over it; without a "this life" to define "another life," that other life would have nothing to serve as its proof. So to answer the question, no I did not have another life before I was born, if by "another life" you mean a life that is truly severed from the one positing it.
5. What happens when we die? That is, what happens to you, personally? (not what happens to your memory or the atoms in your body ... ) Is complete non-existence conceivable?
Death is with us at every instant, usually in subtle forms, but it can never occur because if it were to occur, it would wipe out existence, and the absence of existence is the fact of transcendence, and the fact of transcendence requires existence as its proof. Other people can die, though, and it's by taking ourselves (as a transcendence) for another in the form of the ego that we imagine we can die also. Death is the possibility of the impossible.
6. Which is better-the prospect of an afterlife or the prospect of complete non-existence once we die?
I can't answer this question, because the words "complete non-existence" are incoherent if taken literally.
7. Is it sensible to fear death? How is your answer related to your answers to 2, 5 and 6?
To fear is to sense a force of impossibility with the power to annihilate that which is possible. To fear is to fear death.
Is there an alternative to that fear? No, because even if someone should set out to commit suicide, their efforts will be threatened by the possibility of their impossibility (as with failure); and if you think about that, about how it is that taking another breath can seem terrible in just the same way as death, the relationship between life and its opposite, as well as their interdependence, should become clear to you.