Mortoys saucer-type toy

We don't know what this Mortoys vehicle is based on (suggestions welcome!). It consist of a red saucer with a separate white body at its rear. It looks like a plated hatch cover is missing from the nose, judging by the box top picture.

Box picture

Mortoys saucer box top photo

The Mortoys set box shows this body sitting on a red chassis like the others.