Here is a better diagram.



and then this ...



So the width is 2.1 meters = 82.677 inches = 4.009 cubits @ 20.62 inches per cubit.

Now the height is said to be about 6 feet but I don't think that is correct. I think it is 4.375 cubits or 90.2125 inches or 7.52 feet

Thus the size of the "corridor is 4 x 4.375 x 17.5 = 306.25 and is nicely 17.5 squared with 4 x 4.375 = 17.5 ... the length.

We shall see ...

"There is nothing as impenetrable as a closed mind"
and ..." if everything is a coincidence what is the point of studying or measuring or analyzing anything ?" db