no green water does not sound pleasant,
here is my basic design, sorry for the poor drawing.
this is going on my patio, the 2 walls at 6.2 feet are already there and they are 2 foot high, i am going to brick a curved wall to join the 2. my only worry is pond liner creases with this shape??
i will then mark out my pond and the cut the shape of my pond into my patio and remove the patio and hardcore from underneath, then dig another 2 foot down to give a depth of 4 foot and a pond which holds 3500 litres approx
as far as the filter box and external pump are concerned, i have no idea on make or models. i m going to my local aquatic centre tomorrow to have a look and get a better understanding of filtration systems.
where the pump and filter are situated it is aflower bed, i am hoping to cover them as much as possible with the use of plants.
Jusu curious would it be cheaper to construct the pond with render? and would it give a nicer appearace? | 
