This last week, for some reason, Roy decided to humour me and offered to build anything which did not require pulling the entire pallet apart. (I never look a gift-horse in the mouth in these circumstances!)
Seal the underneath while it is easily accessible.
The cross members and legs were made from door-posts of old garage doors that we bought and recycled a few years ago.
The shelf below was built with a few left-over slats from those doors.
He will build a second one.
They are rough and ready and will be great to use for messy activities in the garden.