Hi everyone, and thank you for all of your insight into this case. I have been following the thread with interest. I think that there are several questions that are left unanswered so far, especially concerning whether or not he planned the deed.
If Madsen had a sexual urge to murder a young woman on his submarine, Kim Wall is probably the worst choice he could make. Firstly, her boyfriend waved her off, so there was no question of where she was when she went missing. If his mission was to kill and dismember someone on the sub, it would have been better to chose someone who had not informed her near and dear about her whereabouts (a tourist for example). Secondly, she was a journalist, so her murder and disappearance would naturally draw international media attention. Thirdly, he did nothing to hide where they were travelling -- there are pictures and even video of the two in the submarine tower. If he was planning to kill her, wouldn't he have tried to make sure that their route was unknown? Fourthly, there is actually no evidence at all to suggest that Madsen had any kind of reason to dislike Wall personally, as it seems they were not acquainted. Having gone through a lot of the articles she wrote, I would also dare to say that Wall was not an investigative journalist, she was interested in the quirky angle, the people on the outskirts of society and feminist issues. She is unlikely to have dug through a paper trail exposing financial issues that would make the rocket project impossible, or technical data to suggest that Madsen's plans for space were somehow unfeasible.
There is however some physical evidence to suggest that he planned it. For example, the witness who stated that he (she?) saw him carry a saw on to the sub before they took off. Also, there were metal pipes (for sinking the body), thick green plastic that the some body parts were wrapped in, an extra overall and a knife. The question here is if he would normally have had all of that material onboard or if it was there for a reason?
What are your thoughts?