Are you serious?? (I'd say "y'all" but that might get me in trouble.)
Revelation has 22 chapters of symbolism. Most of the prophetic books are chock full of symbolism (except the parts that dispensationalist say must be literal in order for them to sell their books).
Details in description does not in any way mitigate the symbolic/representational nature of the image. You think just because dimensions are given that requires a literal interpretation. Well it doesn't. And there is nothing in the Scripture to require it. It is a byproduct of your otherwise faulty hermeneutical method. It fact you have to ignore the obvious symbolism, e.g., the rounded/perfect numbers like 144, 1000, 21 times 12, etc. in order to fit your system.
Typo. Should be 12 times 12.