There are no real answers to these questions, as energy has zero size, zero mass, and zero weight. But the product of these questions would exist in some form and have an energy potential that could be calculated. It should, hypothetically, exist as pure energy once freed of the restraints of matter. I asked a friend of mine, a mathematical physicist, if these questions could be stated or proven mathematically, and a comparison drawn to the projected double. I received a chapter-length reply. The high-level math and physics involved are way above layman level, but the end result was that the projected double was likened to a potential well.
For all that, the projected double is indeed a body of sorts, albeit an energetic one. A projector can perceive this body, but only when parts of it are deliberately self-observed. The subtle body parts that appear seem to be created by the subconscious mind. The mind of a projector does not seem able to accept the total nonexistence of its body, so temporarily creates body parts when they are looked for.
Many entities seem to choose a form taken from the mind of a projector (which indicates some degree of telepathic ability) and use it to generate the maximum possible level of fear. This is a very good reason for projectors to keep their minds clear and mask their true feelings when they encounter or are forced to deal with astral wildlife.
Excerpt from 'Astral Dynamics'
demo copy here-