Re-continued (or not)

I've decided to start working on my Left 4 Dead campaign again. I suppose I realised I wasn't happy with having it so incomplete. I don't mind the length, but ending the second map with "to be continued" or some such is something I'm not really happy with.
I won't be completing the full four or five maps I'd originally planned, partly because that's a lot of work that I don't necessarily have time for, but partly because I've enjoyed the short campaigns Crash Course and The Passing more, lately, than the full-length campaigns, particularly in L4D2. When I released the campaign for testing I probably hadn't thought twice about making it the usual length, since that was the week that Crash Course came out, being the first campaign that wasn't four or five maps long, but it definitely made it a lot more accessible for a quick game.
The currently released two-map version of my campaign, though, wasn't really played that way a lot, and I think a lot of that has to do with the anticlimax of it not really finishing. The finale and even the "credits" are pretty essential to players' enjoyment, in a way that I think is probably pretty unique amoung multiplayer games.

So, the plan is to make the campaign three maps long - the first map being mostly as it is now, the second being almost as long as it is now and the third having the survivors circle around the art gallery building, getting in, making their way to the roof and evacuating in a mystery escape vehicle (go on, you'll never guess*). I'll most likely release both L4D1 and L4D2 flavours. Unfortunately, I've currently got a problem with Hammer whereby it, and only it, cause BSODs every half hour or so. Hopefully a fix eventuates.

*you'll totally guess


Edit: I might never finish this campaign due to multiple SDK updates breaking everything in a bunch o' different ways. Oh well.