RE: New Dumas scidadal Jet drive +nitro or prop
A jet drive would actually work better in a SK-Daddle (proper spelling) as it does have the flat bottom which makes installation easier. The biggest problem would be that the pump would sit inside the radio box which wouldn't leave much room for the radio gear.
You may find that a skeg may have to be installed ahead of the drive to keep the boat from wandering.