Sent you a PM, but thought I would respond here also.
Current status is dusty,... it's been sitting on the shelf for a good while now. I keep thinking of pulling it down, but real life keeps getting in the way.
I originally had to stop work when a large project came through at work,... it devoured all of my spare time. When that finished I had lost the momentum I had, and struggled to keep going,... then I had a new baby at the house and that has changed things quite a bit too. (#3, so I thought it would be easier, but wow, was I wrong!)
Anyways, I am currently working on another of those big projects at work (we get this several times a year.) but when that is over I really want to get back programming on something. I have 2 projects that I am looking at,... this one, and another one that uses a physics engine I have written. The new one is being planned as a demolition derby game,... nothing fancy, no big explosions, just a bunch of hitting each other into submission, like a real derby. I won't integrate the new physics into ShellShock, because the game is too far along to want to add that in, but it is an option if I ever rebuild ShellShock from the ground up.
The other issue that has come up is the name. It was brought to my attention that Shellshock has already been taken, so I'll need to rethink that as well.
If you want to see ShellShock continue, please let me know here, or through PM,... if I know there is interest, it is much more likely to be dusted off at some point.
As for opening up the code, I'm not sure how much use it would be due to the language it's written in. I'm Definitely open to working with someone on it though. I've even considered using XNA and putting it up on the 360 community games site.