The original design by Jetpilot212 is a nice running hovercraft. Please refer to his design to download the basic stl files. I added some modifications to the design that I would like to share:

• The overall length of the hovercraft has been reduced by 20cm. This makes the hovercraft more agile.
• The lift motor has been mounted with 5° downthrust to mitigate rotation problems due to having a single lift propeller.
• The lift propeller is a three-blade one.
• For safety reasons I added a propguard (see attached stl file)
• The thrust motor was mounted in a way to maximize the impeller effect.and secured by more clamps

A video of first testruns can be found at: https://youtu.be/nEmLPvEmf2I

UPDATE: You only need 20'' tubes