I would remove the main engine and replace it with a second and maybe third generator and another electric drive in the main hull. That way you have less points of failure. If the main engine or the generator fails you loose a lot of your speed. With two or three generators, when one generator would fail, you still have all the props and can use them at full power as long as the remaining generators together with the batteries keep up. Charge these batteries from solar to extend that. It also makes it easier to have spare parts and knowlegde on board as you have only one type of generator instead of having a generator and a main engine.
100% Also there could be way more solar above the flydeck. Dont know why they didnt add more batteries as LFPs getting very cheap lately and the solar could tricle charge them while at anchor. Running diesel engine to power an electric drive system could be much quieter i guess. The engine only needs to run at one optimised speed.
More solar cells could be added to the port and starboard roofs. I would convert the sharp front and side bow and sponson edges to SWATH in order to soften the strikes to sea life.
