On my Coast the engine compartment can be accessed by a passage in the galley as well as removing the covers under the companionway steps. I like the idea of closing off the engine area from the fuel tank/water heater/refer compressor/storage area aft and to port of the engine untill I have to take it apart to get access for maintenance. The pictures you show are the same boat but my version is set up much differently. If I was more adept at puters I would post some pictures.