the story you quoted is from the first Half Life2 sp-mappack that i made, together with Baltic.
I made it back in 30-03-2005 and it is called Leon SP-mappack. it contains 4 large sp-maps that are linked together in to one mod.
although it's not actualy a real mod, meaning i didn't add anything custom, i used only HL2 assets.
Still, when you like Final Project and Strider Mountain, then you will also like this sp-mappack.
Between this mappack and Strider Mountain did we make another large sp-mod, quit similar to Strider Mountain qua size, action, and gameplay.
Maybe you have heart of it, or even played it, it's called Coastline to Atmosphere and has 15 large sp-maps and some custom content.
should you be interested in all my sp-mappacks and sp-mods that i have made over the last 10 years then please check my site, there you can
watch movies, and find all sp-mappacks and mods, for a lot of fpshooting games.
Hope you don't mind me telling this all here.
my website;
http://www.leon.triplebit.nl/leon
(aka SPY-maps)