Ok here is a new replay, For some reason its a bit broken,
To fix it:
1. Make sure you have boxshu installed.
2. Drag the file into your replays and view it from the IG replay menu
Tell me if it works for you this is what you should see.

The concept to the replay was to use the box from boxshu, I put gravity to +30 so I would float up at the rate you fall on -30. I would then use the roof as the floor and a spar would take place upside down.

This is the result: