Void space and vacuum space could be one in the same thing.I had to hit "Post" because I thought you might be beating me to where I was going anyway. Not "void" but "Vacuum" energy. Makes that vacuum energies. String vibration(s) to quantum field fluctuation(s) (singularity(ies) to Planck level hot blue-white hole(s)), or something like that.
I woke up with this, I couldn't wait to really think it through, and I'm now going back to bed. I owe IG2007 thanks for driving thought whether he agrees or not with what came of the driving. And you're certainly on track yourself, too. Keep to it, meaning keep thinking it through.
Just potential energy.
I like to use (Void space) to get thinking away from any property that might be the property of something else.
Thought about true nothing and it's properties.
Maybe everything we see is just simply a property of nothing taking up area.
One BB in an endless sea of BB's with a start point just because of Nothing having potential energy.
A good start point to everything some unimaginable time scale ago in a galaxy far far away .