From a kit manufactured by Palaform. Constructed from Depron in just a few evenings. Comes complete with skirt and optional electrics pack. Extremely light and manoeuvrable on hard surfaces and water, not grass. It weighs 83 grams including the battery and electrics.
Available on the internet from Palaform Ltd.
https://modelhovercraft.co.uk/ocart/index.php?route=product/product&path=59&product_id=53