[rule clarification] The size of an astral form, Synner: your ruling is needed (again ... and again ;-)) Options

[apple]

1) How does the astral form of a human shapechanged into a dog look? Like a normal human? Like a human squeezed into a dog? Like a dog with human features?

2) How does the astral aura of a human shapechanged into a dog look? I assume still a human?

3) Assuming astral projection, perception or dual natured critters: does the size and form of an astral form has any connection to the size and form of the physical form? Can a human have the astral size of a dog while being a human or can he have the astral size of a horse while being shapechanged into a dog? Or is the basic astral form for astral projecting, dual natured critters or astral perception tied to the physical form and its size?

4) How does the astral form of a shapechanged human interact with a (dual natured) ward? Can a human shapechanged into a dog walk through a very small opening (dog sized) in a dual natured ward with triggering an alarm? Or would he trigger an alert because his physical dog-body would pass, but his human sized astral form would crash agains the astral ward?

5) Can Masking (Initiate) change the size, "look" and form of an astral form so that you can pass through very small astral openings?

I am very sorry if this question has already been answered ... my search-fu was very weak. If there is any official ruling or clarification on this matter I would be glad if someone could point me to the corresponding discussion.