Thanks Jon for finding time to read my essay.
It may be that I have to improve and make clearer the points I was trying to put across. Especially as you ask, "I believe your view is that in order for space/distance/point to exist in this universe, it must be constructed of something", "too many people will find it hard to abandon the notion of a background space that exists independent of matter", "...a point that expands and creates space itself", "point must exist "on top of something", or else it really isn't a point in our universe"
You are correct that the view is that whatever has the attribute of being extended must exist. Space/ distance/ point have extension and therefore must exist. Also all 'somethings' must exist. But given the economic and frugal ways of Nature, it is speculated that if it wants to create what exists, it would so to speak use one stone to kill two birds and intelligently make 'somethings' and 'space' of the same raw material. Hear this Newton from his paper [link:www.earlymoderntexts.com/pdfs/newton1666.pdf]De Gravitatione[/link]:
"...it is clear that they (philosophers) would cheerfully allow extension (space) to be substance, just as body is, if only extension could move and act as body can" and
"...space is capable of having some substantial reality. Indeed, if its parts could move..., and this mobility was an ingredient in the idea of vacuum, then there would be no question about it - parts of space would be corporeal substance" and
"And my account throws a satisfactory light on the difference between body and extension (i.e. between a body and a region of space). The raw materials of each are the same in their properties and nature, and differ only in how God created them..." All from my 2013 essay.
In essence, point is the fundamental unit of space, 'atom of space' if you prefer to call it so.
As a result there cannot be point existing on top of something. Location is the substance, and substance is a location and the smallest unit of location/ substance is the non-zero dimensional 'point'. There cannot be more than one point at a point.
Re: "But what about a discrete physics model where there is a network of nodes, like what Stephen Wolfram postulates?"
The questions I would like to ask Stephen Wolfram if we met are: what is a node made of? Is it an extended thing or a zero dimensional object or a substance? What is a network connection? Is it a distance and therefore have the property of extension? If network is spatial, i.e. of space, is it infinitely divisible or is of finite divisibility? Is the network constituted of points?
Knowing the frugal ways of Mother Nature, would it make nodes and networks of the same one substance behaving differently or two different types of substance.
Finally, you seem to suggest that 'line' should be differentiated from 'distance', why?
Many thanks for your time and looking forward to any further comments.
Regards,
Akinbo