Up to now, when the mind stills, when thoughts and memories, imaginings and feelings clear out, there is an aware knowing, or sometimes a profound stillness.  In these states, I have not detected an observer who remembles a godly being or any being with subtle or divine form, limbs or personality.  If you have found such an observer, perhaps you can give some clues! 

In the meditation above, firm resolve and application of the technique, enabled the total sealing off the psyche leading to an experience of unpenetrated awareness (awareness free of thoughts, emotions, sensual impressions, sense of self as an "I"). It was so obvious that I couldn't not diagram it for reflection. So out comes the "I" for reflection! 

An observer is an observer regardless of his/her/it having or not having subtle or divine form, limbs or personality. Is there an observer or not. I am open to the idea of an experience where there is no observer but where there is observation without an observer or as you stated:

the act of observing is a natural feature of awareness and that acts of observing arise from awareness

which means that you are stating that your experience is that there is observation which arises from awareness but not from an observer.

Okay... that is clear!

In my experience there is an observer but it does not have limbs and senses in the experience because it is not permitted in the space to allow that. This is similar to when two men enter an aircraft and only one fellow is experienced at flying the aircraft. In that case the unskilled person has no limbs which can be used to pilot the craft and so even though he does have limbs, he, for all practical purposes is limbless while the skilled other person has limbs because the vehicle is outfitted to use his skill.

In these experiences, in my notes, there is a limbless observer who produces awareness which is in contact with spatial awareness but that observer is spherical in shape with energy emanating from it continuously but it has limited expression because of that specific level of awareness.

If the core awareness of a monkey is transferred into the form of an amoeba, that monkey will no longer have functional limbs because of the limits it encounters due to the amoeba form restrictions which does not accomodate limbs.

So yes, in that situation it will experience itself as being limbless. However we have to be sure that there is no other condition of express because we can be sure about its format.

The awareness as you experience it has no core or format, no gravitational field. Okay... that is accepted as your experience as contrasted to my experience where it is like a round earth with a central core and the center of that core being the source of gravity, where it is a spherical influence.

More information about your experience would be useful as it gives a fresh perspective and challenges other experiences in meditation.