I think more so the point is this Striker...
1) It won't work. Not that no one has figured out how to do most this coding, just that in the GoldSource engine, it doesn't tie together and makes things beyond screwy. It just can't happen.
2) Even though we've stated that it won't work, if somehow we entered a fantasy world where it WOULD work, and it was successfully made and finished, who would WANT to play it? Look at it this way:
a.) Primitive Version of Half-Life 2 featuring numerous bugs and glitches, weak graphics, and highly condensed gameplay
b.) The real thing, featuring beautiful graphics, expansive levels, next-to-no bugs, and fully featured including all the levels, gameplay, voices, and such forth.
3) Back to ANYONE that is going to mention Black Mesa again based on what I said. In simplest respect, Black Mesa is turning an dated game from an old man into a beautiful young woman. This project would be the opposite. I'm sure most of us wouldn't like our young beautiful girlfriends turning into wrinkly old men, so why would we want our games to?
Regardless, if this is an endeavor that the OP wishes to pursue, then I wish him and his team good luck, you're going to need it.