Add all the stuff below to a single page called SketchupDocumentation. The page will live on your wiki, it may also be used to display someplace in the school or community.

Export screen shots of each of the things you have made
Put them on your wiki
Upload the file to your wiki
add some text explaining what you were trying to do with each of your designs
What was difficult?
What did you learn fron doing the design?
Upload your designs to your wiki.