Here's a mixture. A kids car with a motor bike motor by Villiers.
A trike you have to see to believe. Silverbear and I will not be trying to make one.
And a 4x4 that I wouldn't mind having.
Brightwells: ATCO child’s car to Volvo’s pig car, plus bonus Veteran power trike at Hemmings Blog: Classic and collectible cars and parts