I think your theories show good insight, however I do have some comments, I hope they will be useful...
Part One (1) I think you're right about things having contrast, but not that all contrast is of opposites. For example Yellow which is 'not Blue' is not the opposite necessarily the opposite of Blue, as many colours contrast with Blue.
As you can see in my entries, at the bottom is says 'There is no negative one...', which is intended to mean a couple of things. One thing is that there is no exact opposite in every way, to make something clearly another thing's opposite.
As 'nothing' is something which basically has no form and no existence, it would be impossible to have it exist in any way, and for any length of time. I'm sorry I still don't know whether the Universe just started somewhere. I have a theory (I have not shared before), which involves the Universe being the only possible way things could have existed. The theory also involves the idea that there is no such thing as time, as what happens is just a process, with no time on the clock at any end, each moment only distinguishable from the next by it's place in the process.
Part Two (2) You may need to expand on this idea if you could. You are right that if anything can happen it will happen, spot on there! I'm not sure anything is possible, even with infinite time, some things were just made not to happen, for example things that make no logical sense in the first place. By which I mean Yellow being Blue, or One being Two, etc.
What we have in technology, elements, thoughts, planets, systems, etc. Can be quite individual and everyone's experience of them are different. But, they are there due to all preceding events, yeah...
Part Three (3) Yes and Sort of. In some ways (some points of view) we're part of the same system, and in other's we are not. But usually in the ways that we're not part of the same system is because we have abbreviated the world around us to only include the immediate environment, as you can understand to include the whole Universe in every expression would be impractical, so we abbreviate. This sometimes causes us to differentiate between one system and another.
God could well be the glue, but you need relatively sticky things (like humans) for the glue to stick to. I'm sure you can understand glue is wasted on oily surfaces... Maybe God is wasted on some things too, like those which cannot be at one with God. Don't really know the full story there... Sorry!
Part Four (4) God as a singular being works on one level (this is highly theoretical though), being that God is everything, including you and me. How can that idea work? Well, what if we were actually the same person (God too). As we experience our lives in precise moments in the process of the Universe, the being (which is you and me) is able to be in two places (which when I'm looking at you, appears to be in two places at once) at two separate times, in two different people. Basically for this to work, one's memory of being in two places needs to be wiped. Handy that one explanation for memory is that it is all of the physical body! Or whatever would be considered the physical.
With energy and matter being created or destroyed. Well, if all that exists is experience-based, nothing need really exist in that way. If it was all just passing before our eyes, the whole Universe could just be virtual (something I'm sure you've thought of before) or almost hallucinatory (in that it never really happened).
If you combine God's power with the idea that you had that anything can happen in infinite time, you have another answer there...
I think you've done well to get to this stage, and look forward to any further posts Lucidity.
I hope my comments were valued and thought-provoking! I would love to hear what you thought of them...