In the recording where he talks about selling the house, he says that he is looking to put it on the market ASAP because "there's no way if Laci comes back that we're going to stay there" That is a direct quote. He clearly, with his tone, indicates in this response that with everything that has happened, he would want them to move somewhere else, a different home, for a 'fresh start'. Turning the nursery into a storage room (which he didn't do, he just stored things there, he did not clear it out and make it a storage room, specifically) could have been his way of dealing with the missing/loss of his unborn child. Distracting himself from the room and starting to use it for something else. People handle grief and extreme emotion in a myriad of ways.
Scott told the authorities directly where he was fishing. Why would Scott, if he was the murderer, tell police exactly where he was fishing, knowing that is where he disposed of her body and knowing that they would put two and two together? A murderer isn't going to tell police they were in basically the exact same area/waters where they disposed of a body. Scott was honest with them about where he was fishing and his location because he didn't murder her and he wasn't the one that disposed of her body.
I don't know how your last points are circumstantial evidence. Scott said he watched the Martha Stewart program with Laci and it was proven that the topics on the program, about the meringue that he tells investigators about, were in fact what that episode was about on that date. He could have easily gotten up with Laci that morning and took part in her morning and what she was doing before he left.
