# one stick

"it was one stick wide." This was about 3.2 meters.

# the temple gate that faced east

"the gate on the eastern side of the wall surrounding the temple" or "the gate on the eastern wall of the temple courtyard". The gate was part of the wall surrounding the temple area but wasn't part of the temple building itself. 

# up its steps

"up the steps of the gate"

# in depth

"from the front edge of the threshold to its back edge"