German design study, probably dating from 1940, for a twin fuselage ('Zwilling') fast bomber. Unlike most similar design, which were based on existing single seat fighters, the 530 was 'all new' and would have required a lot more investment to put into production. As a fast bomber the aircraft would have been umarmed (like the British Mosquito) but there may have been a proposal for a bomber destroyer version with a 50mm gun mounted under the central wing.
The (shallow) spherical depression under the central wing section is for mounting the model on a 6mm BB.