We owned a Lagoon 40 in the TMM fleet. Things are a bit tight on 40’s and we upgraded her to a Lagoon 42 (2023). Much more room overall. That 2’ makes a difference. That said most berths in boats this size are very comparable. Sure you don’t want a 42? An owners version would be good for a family of 4-6 and at a better price point typically than a 4 cabin. (provided you are captaining yourself).