ADDENDUM: in-part prompted by the last line of your [Boris'] essay.
Dear Boris, captured by your opening paragraph and your Cartesian emphasis (and being, as you know, a Maintenance-Mechanic specialising in FOUNDATIONS) -- [oops, caps = Freudian slip] -- I was delighted to see you using [see my essay] Born's Law on your p.6. And more intrigued when I saw your closing line: "Physical space is the body of God in which we exist and in which wander on the way to it."
For this line triggered a corrective recollection from my years of teenage rationalism (as yet undiminished)! Though, at that time, I was not aware of (and therefore was independently following, in my terms) Descartes' Dictum (DD):
"Never accept anything for true which you do not clearly know to be such; that is to say, carefully avoid precipitancy and prejudice, and bring nothing more to your judgment than what is presented to your mind so clearly and distinctly as to exclude all ground of doubt."
For I immediately recalled, from the KJV English Bible --- Acts 17:28 --- For in him we live, and move, and have our being; as certain also of your own poets have said, For we are also his offspring.
My own translation, from the Greek [so keen was I to understand such things] was: "In God we live, emote, and develop [our will and intellect]."
And when I looked for those poets, I found a related verse from an invocation to Zeus! As google now tells me: Zeus, in ancient Greek religion, chief deity of the pantheon, a sky and weather god who was identical with the Roman god Jupiter. His name clearly comes from that of the sky god Dyaus of the ancient Hindu Rigveda. Zeus was regarded as the sender of thunder and lightning, rain, and winds, and his traditional weapon was [electromagnetic] the thunderbolt. He was called the father (i.e., the ruler and protector) of both gods and men.
Thus, in this way, we arrive at a true fundament; in my view suited to the rationalist and the religious alike. It goes something like this: "God: in whom we live, emote, and develop our will and intellect; and, as a certain poet has said, From whom we are all related."
I look forward to your comments on this joint enterprise.
As for your ideas re Descartes ideas, I must (at the moment, subordinating space and mass to God) invoke DD.
With my thanks and best regards,
Gordon