Body – tactile sensations, ‘space’ of body. Experientially, is the body solid? Noticing the ‘space’ that the body occupies, are there perceptible boundaries between body/not body? Does the body have a particular shape or size
The body is not solid, it doesn't have a defined boundary. The more deeply I look for the space and size of the body, the less I can find it. The only things I could define was a sense of warmth and movement, though I know these are just words for undefinable sensations.
Sights – Is there a (perceived) ‘inside’ and ‘outside’ in the field of vision? Where are sights arising (in direct experience)? Is there an ‘edge’ to what is seen, or simply a field of colours which is mentally imputed as an ‘edge’?
With open looking the field of vision expands, and there is no inside or outside, just a field of colour, wide open and no objects. So I start off looking at something, say a tree, and then it broadens into the space of awareness and becomes just a field of colour.
Sounds – Where are sounds arising? In direct experience, are some sounds closer and some further away? Does that ‘space’ have any perceivable boundaries?
Sounds have different qualities, so that rather then being further away or closer, they are just softer or louder, sharper etc as they arise in the space of awareness. Conventionally I could say the sound of the bird is coming from outside in the garden, but in experience it's just an arising, which I call sound, and it has various characteristics.
Mental activities – Where are mental activities arising? Is the ‘space’ in which mental activities arise any different from the ‘space’ in which the other senses arise?
Mental activities arise in awareness and I can't find any difference between this and 'where' other senses arise. It's just the space of awareness.
Perceptually, in direct experience, is there a ‘place from’ which arisings are experienced? Where are the arisings happening? Are they arising to anybody/anything?
I can't see a place, just the ongoing spacious awareness itself, in which and from which arisings happen. To the extent one could say awareness is a 'thing', then yes, but that's all.
Is awareness a property of something else, an ‘I’ or a ‘me’? Can you find an ‘I’ that is aware?
In spacious awareness there is no 'me', just recognition/awareness.