The Sand Hopper or Skimmers, were supposedly built as off-world pleasure craft (see other concept). They were secretly being customised and rebuilt for the military and key to the change of power on Sentris four during the outer levels revolt of 1070. The four engine craft were extremely adaptable and could be deployed across all coastal and lowland areas on Sentris.
This was an idea for a vehicle that I had way back when working at the BBC in Cardiff in 2010. It wasn't until I started using Zbrush in around 2016 / 17 that I at last had the tools to sculpt all the curves and parts as I wanted.