Well, that was fun.
I spent most of January working with the L4D2 level creation tools - and it's not quick and easy. Sadly, putting together an L4D2 campaign is probably not in my best interests, as far as indie creation goes.
So, while I haven't abandoned that project, I'm putting turbo speed back into VC:BO and getting back into gear. And I'm also engaging the overdrive, 'cause now I'm behind in my progress!