Jeff, I beleive Sunsation was going to go with Westerbeke on MP's F-4. Some good reading here --> http://www.westerbeke.com/
At one time they did talk about going with a Fischer Panda diesel genset but ultimately ended up at going with a gas genset.
Give John a call tonight and he can fill you in on all the details. He has had a few conversations with the factory on this topic.
Hope you, Sandy, and family had a great holiday weekend!