I saw this recently at the Coventry Auto Museum. It made me wonder if it could be done on a Suzuki Jimny chassis? Small, tall, sit up and beg. The Jimny is a little wider and a little longer, but it could be a goer. The JC Midge Mk2 used the Suzuki as a doner, but it looks like it never took off.
Slightly Noddyish I know, but in that colour, and with the aluminium bonnet, it just appealed.