That is the Energy 48 built by Arthur Martin of Martin Marine. He basically scaled up his popular Appledore 16 rowing shell by 3X and put some small accommodations inside. WoodenBoat magazine featured it in an issue probably back in the 1980's, unfortunately there were no takers for more boats as a 48' boat with 20'er accommodations was a no sell even though it operated on not much more than diesel fumes. Personally I like it, Off Center Harbor's Aroha is very similar in concept.
https://www.proboat.com/2018/07/ener...power-cruiser/
https://www.offcenterharbor.com/aroha/