So, I see that you guys are using the following quote to justify that the dimensions are significant in size, extending infinitely through all 10 dimensions:
"Every existence multiplied by possibility. And spread out before space and time in infinite measure. -Mar Novu"
However, when we read the full context of the quote, it seems to be just about the infinite universes in the multiverse during the Crisis on Infinite Earths. It doesn't really refer to higher dimensions.
Crisis on Infinite Earths: Part One
Mar Novu : In the beginning, there was only one... a single black infinitude. Then the infinitude found release, and finally, the darkness broke, filling it with life. With the Multiverse. Every existence multiplied by possibility, and spread out before space and time in infinite measure. Civilizations rose and fell, and rose again to cross realities grasping expanse. Life, a precious gift persevering in the face of every obstacle, until finally, the age of heroes was born. Chaos, the constant enemy of life, kept at bay by champions from across the Multiverse. Joining forces to fight on behalf of all creation, they found each other just in time. Because now, the entire Multiverse is about to come under attack. There is a malevolent force at work, one driven by a singular goal.
Alexander Knox : [on Earth-89 Gotham City] I hope you're watching, big guy.
Mar Novu : The destruction of all there is.
Ray Terrill : [on Earth-X] Oh, no!
Mar Novu : I have planned. There are those who say I have schemed. But the time for preparation has passed. The Crisis is now upon us all.