Hey Stendec,
As you know, when considering the "exact" length of anything -- to its logical ends, you just realize that you have crossed over into "quantum" theory.
Quantum Mechanics (metaphysical) simply do not jive with Newtonian Mechanics (physical).
In my mind, this already confirms the "programmed" nature of our created reality. A planck length is simply the point at which in relation to the speed of light -- any shorter length has no meaning in this reality. This is the nature of the "micro" limits to our "granular" reality.
On the "macro" level, the "
light cone" concept also shows you the limits of your reality in relation to the speed of light. i.e. if a rocket ship traveling faster than the speed of light took off two seconds before the creation of this universe, it would theoretically never exist in this universe.
Another way of looking at the light cone idea, would be looking at the stars at night from our earth vantage point. We know that the light hitting our planet now that we are observing for some of the distant stars and galaxies is already billions of years old, i.e. whatever was going on at that point in the galaxy that we are observing now -- took place billions of years ago. If you take the instant the earth officially came into existence (perhaps 4.5 billion years ago) as the starting point, any light created more than 4.5 billion light years away could never exist in our reality. So, perhaps 4.5 billion light years is the "ante-planck" length?