Other than "how much does it cost?" and "how long will it take?", most questions we receive concern wood and plywood. we will be adding the. 18′ custom built wood runabout with berkeley jet drive. built by the owner from plans by glen-l marine (mist miss). 403 oldsmobile engine (rebuilt locally) with. Driving speed dreamon is like playing with a giant jet ski. you have plenty of excess power for most any type of maneuvering, unless of course you’re wide open doing.