If cost has to be the primary consideration for processing 5X4 colour or B&W, then any Patterson universal drum can be cheaply and easily converted to take up to four sheet of film without overlap. before I got into the JOBO system, I used the small Patterson universal drum to develop two sheet of 5X4 at a time which was very ecconimical and produced perfect results every time. It is done by discarding the reel, and making a 1/8" hole through the centre support. Then pass a stainless steel rod through the support so that it is a tight fit on the sides of the tank. The film is then kept under slight tention and away from the sides of the tank, even development is assured every time. So cheap - it's almost sinfull! Good luck Stan.