Pedal Driven Aluminum Catamaran

So I live in a city with a lot of water and I have wanted to have some kind of boat for a long time. I don't have any place near the water where I can store a boat, so it had to be transportable and not too big. And yet I wanted enough space for 2-3 people to relax on it comfortably without space problems or you know.. sinking. I also needed it to be human powered because any kind of motor is forbidden on Hamburg waterways inside the city. And you know I'm into bikes so rowing was out of the question - and