It seems to me that this arrangement was along all of the walls of the Ulam. My proof is from Rambam Hilchos Beis Habechirah 4:9 who writes "Around the walls of the ulam from the bottom to the top was amoh rovad 3 etc.". One notices that the Rambam uses the plural "walls" which suggests that the amoh-rovad arrangements was along all of the walls of the ulam.

According to this, the amoh-rovad pattern was not only along the long wall of the ulam facing the outer mizbeach but also along the shorter walls at the left and right side of the ulam, as well as the short walls at the back of the ulam where it jutted out from each side of the heichal.

Good Shabbos

Dovid Bloom

It seems to me that this arrangement was along all of the walls of the Ulam. My proof is from Rambam Hilchos Beis Habechirah 4:9 who writes "Around the walls of the ulam from the bottom to the top was amoh rovad 3 etc.". One notices that the Rambam uses the plural "walls" which suggests that the amoh-rovad arrangements was along all of the walls of the ulam.

According to this, the amoh-rovad pattern was not only along the long wall of the ulam facing the outer mizbeach but also along the shorter walls at the left and right side of the ulam, as well as the short walls at the back of the ulam where it jutted out from each side of the heichal.

Good Shabbos

Dovid Bloom

Follow-up reply:

One of the Gedolim here answered your question by saying that it has not been explained by the Mefarshim whether all of the walls of the Ulam possessed this arrangement or only the one facing the outer Mizbeach.

Kol Tuv

Dovid Bloom