It's pretty fun and it reminds me of SMOD but man... Half-Life 2 based multiplayer mods barely see active players if ever and I'm talking about the mods that collect dust on Steam like this one, Modular Combat, Smashball, NeoTokyo and to name a few.

So, is there demand? Meh...I think not unless you get in touch with some peeps on ModDB and something cool could happen.