Obviously as we know, in the end the NSDAP was the eventual winner of the tumult of the late Wiemar government, but the KPD gained ground during the period as well, and it was far from a sure thing that Hitler would be appointed Chancellor, or that the NSDAP would be able to secure a majority in the 1933 elections; undoubtedly, combined with the KPD's gradual growth of popularity during the period, it had to seem as if it was at least possible that they could achieve an electoral victory, should the dual economic and political crises fail to abate.
With that in mind, what do we know about whatever plans they may have had for the aftermath of an electoral victory? Did they anticipate the possibility of mass resistance against their election, perhaps even armed resistance by the Reichswehr, with the support of right-wing paramilitaries? If not, did they believe that their assumption of power would be largely tolerated, or was it a situation where they anticipated resistance, but preferred to react to whichever forms it took as the individual situations developed?
You may be interested in the answer to an old question I had:
The answer relies primarily on a single source (Evans’s The Coming of the Third Reich) but it seems to indicate (particularly in the follow up answer) that the Communists didn’t fully expect to come to power in a democratic manner—they apparently expected to come to power in a revolution similar to the October Revolution in Russia.
The answer is not ideal but it is a place to start.