Here we go with this conversation again......
I have never had ANY problems finding the leaks with the "point file". The point file does get a little weird with an entity leak such as a ladder because it is not exactly clear to you what is happening unless you know what to look for. The "single" red line is always there to point the way tho-- and there has only been "one" single red line for me. Not exactly sure what kind of crack you people are on but I have been mapping since Half Life 1 came out and never seen more than one red line--maybe in the .lin file which I have never used.
A leak is a leak and is easily found with the point file in camera mode. If you want to keep the wall you have at the bottom then move it in and place a nice no-draw brush behind it to seal it. You can also move the wall itself back to world and simple brush state. I don't see a need to move the sky down as it appears that is the way you want the wall to look plus running a sky texture behind something is simply wasting sky. Use as little sky as you can as it sucks the performance out of your map and makes it slow to render.
http://twhl.co.za/tutorial.php?id=129That is a source tutorial but should work just fine with Half Life 1 as well. Hammer didn't really change at all from HL1 to HL2--well, other than steam.
Hope this helps.
Dunivan