Be practical, even though the addition of a mini galley may make for an interesting project, it will not do much for your boating enjoyment. In a boat where headroom is limited it is more comfortable to conduct chores such as cooking and washing dishes in the cockpit. We used to pack a one burner butane stove as they were quite convenient and would wash dishes in a bucket. That same bucket had many other uses aboard like a morning wash basin, help take a bath or wash the boat and in an emergency it could be used to bail water. If intended to be used as a head would strongly suggest two separate buckets. What we did was come up with three different configurations. We had a configuration for when the boat was underway, another for lounging at anchor and a third one for bedtime. The same space had to serve different functions depending on the configuration. For example the V-Berth Provided storage when underway and a place to lie down at bedtime. Once we had the configurations down pat it was easy to change from one to the other and we knew where everyting was. We could do everything in these boats that could be done on the bigger ones but not by trying to do it in the same manner.