The Blériot 127 was a relatively large aircraft for the era, featuring a conventional basic configuration and open gunner's positions in its nose and at the rear of its two underwing engine nacelles.

Both the rudder and elevator were provided with compact regulating planes similar to those present pm the ailerons while actuation was achieved via a series of flexible cables.

[4] The wing of the Blériot 127, which lacked any external bracing, had a trapezoidal shape with a straight leading edge that was optimised both for aerodynamic efficiency and to minimise its obstruction to the firing arcs of the aircraft's self-defence gunners.

A combination of box girders and oblique tubular struts supported the engine bed, the suspension plane of which corresponded to the lower part of the wing.

The relatively high speed of the aircraft for the era posed some challenges to the effective firing of defensive guns, although Blériot made attempts to compensate for the sighting difficulties.

[7] To this end, the forward gunner's position was protected by the circular cowling while the other gun mounts were provisioned with windshields on the top of the wing, which would only be raised while firing.

[4] It featured a false axle along with a pair of wheels, double cross-bracing that mitigated the stresses from skidding, and shock absorbers that used a combination of rubber and cables.