The SQS scientific instrument at the European XFEL is dedicated to investigations in the soft X-rays regime, in particular to studies of non-linear and ultrafast processes in atoms, molecules and clusters using a variety of spectroscopic techniques. It will be equipped with a Kirkpatrick-Baez (KB) adaptive mirror system enabling submicron focusing and access to variable focal distances. In this paper we describe the conceptual design of the beam transport and focusing layout based on the KB system. The design includes a study of feasibility based on the comparison between the required source and image positions and the theoretical limits for the accessible mirror profiles.