Ha ha couple of years ago I pretty much sat in that same seat. Just remember the piles of pistachio shells everywhere! Yes steep, but not 45 degrees. A domestic staircase is supposed to be limited to 42 degs.
Back in the day, terraces were never that steep really, certainly not 45 deg in most cases - didn't seem to hamper sound projection then.
Out of all you've said, the main difficulty we have, is quite simple - we don't have enough people who want to sing all game. Even if you undertook some...