Walter Günter, one half of the famous Günter brothers, looked at the existing He 112, which had already been heavily revised into the He 112B version and decided it had reached the end of its evolution. He started over with a completely new design, "Projekt" 1035. Learning from past mistakes on the 112 project, the design was to be as easy to build as possible yet was a design goal. To ease production, the new design had considerably fewer parts than the 112 and those that remained contained fewer compound curves. In comparison, the 112 had 2,885 parts and 26,864 rivets, while the P.1035 was made of 969 unique parts with 11,543 rivets. The new straight-edged wing was a source of much of the savings; after building the first wings, Otto Butter reported that the reduction in complexity and rivet count (along with the Butter brothers' own explosive rivet system) saved an astonishing 1,150 man hours per wing.