You can also check this website to see when they are going to make more of these interactive Congo toppers.
[youtube]https://www.youtube.com/watch?v=lIajj1pENrg[/youtube]
http://www.pinballtoppers.com/Congo.html
I'm currently working on a custom topper for my Congo using a DC3 model plane similar to this:
Also bought a few small motors to attach to the propellers and will be tapping into some flashers to make them spin occasionally during game play.
I'll post a step by step tutorial later once it is done if you want to make one yourself.