Structure of the Universe :
"Cosmic web". A 3D web like structure connecting the super clusters of galaxies. That looks more like the neurons of the brain. But made of dark matters.
Dimensions :
Dia of our galaxy : 0.2 unit.
Average distance between galaxies : 3 units.
Local group : 10 units.
Super cluster that milky way is part of and that are linked by the cosmic web : 500 units.
The visible universe is only 400 thousand times larger than our galaxy. Not unfathomably large.
If you draw our galaxy as 1mm dia. The visible universe will be 400 meters wide, in scale.