Akinbo
You asked me, again to look at your essay.
Overall, I do not understand what you are trying to convey, and your assumptions about the generic physical circumstance are incorrect.
There is no 'it' as such, other than in the sense that ultimately physical existence/reality must comprise of something (or various types of something). A reality, ie what exists at any given time, is a discrete definitive physically existent state of whatever comprises it.
Space is implied by existence (ie of something), we do not measure space, but the difference, spatially, between somethings. This might sound like 'splitting hairs', but the important point is that one can only establish the space between/relative spatial position of whatever is existent at the same time, and that is a specific physically existent state. Not a thing. There are more than 3 dimensions, this is, rather like things, just a high level conceptualisation of what actually occurs. The concept of dimension is associated with any possible direction, either way, of the spatial footprint of whatever physical state being considered. So, however many directions the smallest thing can travel from a spatial point, halved, is the number of possible dimensions. This would represent a line as you define it.
The point is this. When considering distance, spatial position, etc, what we are doing is imposing, conceptually, a spatial grid on any given reality. Although it is probably impossible for us to do, in order to properly correspond with what physically occurs, that grid would need a 'mesh' size equivalent to the smallest existent substance. The grid is located with respect to something. But if we do not understand how reality occurs, then application of this gets confused, eg we are relating things that do not exist at the same time, or we are referring to things that physically do not exist as we conceive them, etc. X=vt can be misunderstood. The concept is that space is being expressed in terms of the duration it would take something to travel a distance. But it cannot actually do this, because whilst doing so, the reality has altered.
To put this all another way around, there is no duration, no motion, no change of any degree whatsoever in a reality. Any difference constitutes another reality, ie a different physically existent state. There cannot be two different states of whatever comprises existence occurring at the same time. Duration, motion, a degree of change of any type is a reflection of the difference between one reality and its successor. In other words, it is a sequence.
Paul