Sensori 78 dive charter carries 12 guests in 6 double cabins with en-suites and has berths and bathrooms for up to 8 crew (5 is the normal compliment). The main navigation station is in the raised pilothouse and there is a second helm station on the flybridge but the flybridge is not enclosed. Sensori 78 carries a 5m tender on a lifting platform. She has a 3000nm range with twin Volvo Penta IPS drive engines.
The top deck is a great space for lounging and yes, you can have a helm station up there but a roof over the top deck would not be in keeping with the concept at this size. There's accommodation space below decks for up to four double cabins with en-suites. If you're happy to sacrifice a bathroom or two you can have a large sundeck in the forward of the saloon with direct access through to the saloon.