We plan to have two aluminium custom-made tenders. After looking around we found they end up costing about the same or less as RIBs like Novurania yet last forever.
We'll equip them with diesel engines and traditional shaft driven props. Gasoline fumes tend to ignite very easily so we prefer not to keep it on board for safety reasons. Besides, diesel engines require less maintenance and are more reliable.
The design is in the hands of Van Vossen engineering in The Netherlands and based on their Twister 680 model.