The ships that plow the deep space between the stars and the contraptions found within the Empire are of crucial interest to the inquisition. The "Inquisitorial Blueprints" are a coveted set of plans for some of these designs.
Some followers of the Adeptus Mechanicus frown upon the existance of these blueprints, considering them the rightful property of the Adeptus Mechanicus. The infamous tech-priest Magos Mechailis X has long waged a clandestine war against the inquisition on this matter, trying to have the responsible inquisitors sentenced to eternal servitude as servitor skulls.
Thus far he has not succeeded.
A number of Blueprints of Warp-travelling vessels are available and these ships are shown here to give an impression of the proportions.