Lesschumras, you seem to be misunderstanding me; let me explain what I meant: the ground level at the highest point of har habais is the lowest possible height of the kodesh hakadashim, which was not that much higher than the floor of the azara. The area underneath the floor of the azara (with the possible exception of the beis haparva according to Tosfos in yoma, but mipashtus even there Tos would agree) has a din of mechilos, which don’t have kedusha. Ergo, the inside of the walls at the current ground level of the kosel plaza (which is more than 15 meters underneath the highest point of bedrock on har habais) , as well as inside the tunnels, with the exception of the northernmost section of the western wall, the northern wall, and all but the southernmost portion of the eastern wall, should, at the worst, have a din of mechilos and not have kedusha of the azara.
I’m sorry if my behirus before caused any confusion.
In regards to which rabonim where chayish that it was a wall inside the boundries of har habais, whether of the heichal, the azara, the migdal, beis haknesses or beis hamedresh, or some other building there I’ll try and find the t’shuvos for you, there were a number of them written after 1967, as well as a couple from the times of the later achronim (although finding this kind of thing is much more up GOAN’s alley).
Oh, and it’s kind of funny that you ask if I was ever there – I’m one of the people who hang out there all the time, normally in one of the section that aren’t open to tourists… but yeah, I know what it looks like over there.