I think in terms of the ride, you should start from the scratch and just use the abandoned concept as inspiration.
How about an area that's like walking into a 1920's short? Have it enclosed in a big building like Studio 1 at Walt Disney Studios .
http://farm4.static.flickr.com/3045/2815130803_ce08c38c1c.jpg
I only say that because if the entire land is in black & white, the blue sky would ruin that theme.
Maybe have it like a studio that the toons work at, so instead of being animated, they were actually directing and acting and putting on real shows?
Then your ride could be the 'filming' of a short, with you as the main character; that way you could have all the other classic characters interacting with you; 3D effects like water spray, pies being thrown etc.
Then at the end it could take your picture and superimpose it into a "That's all folks" style title card.
What do you reckon?