If she was dead by say midnight of the 23rd it seems only logical that he would use the cover of darkness to assist him in disposing of the body. The difficulty of waiting until the morning and transporting her body to his "work space" and then to the Marina is that any friend or relative of Lac's might have called early on the 24th looking for her. As long as he could establish an alibi that he had already left he probably felt he was in the clear.
However, if she died somewhat later that night say 4 or 5am of the 24th, he had to work quickly to prepare her body and come up with his plan and alibi. Darkness would not have helped him since it would have been light before he could have gotten everything in place.
The initial report on the bloodhound was that they followed her scent to to the driveway and lost it which led them to believe that she had departed by car.
If she didn't die until early that morning then I think it is possible he was forced into a plan which entailed wrapping her body in a tarp (blue?), weighting it down with the umbrella standards because of their weight, and driving her corpose all the way to the Marina.
Experts here have already said how difficult it would have been to boost her body up over the side of such a small boat in the chop of the Bay without tipping over, but perhaps he was able to accomplish it. Maybe the tarp got away from him and resurfaced later on shore.
So I think it depends a lot on when she actually died. Is possible she was killed in her sleep and never knew what hit her?
I just thought that the evening of the 23rd was the most probable for an intercepted phone call, motel receipt, discovery of a gift for Amber etc., since they would both be up and about and people could contact them. But she may have died in her sleep in a plan he plotted hours later after a violent confrontation in which she stated her plans to divorce him.
My main objective was to focus on the "coverup" he is trying to get away with. To show that he had ample opportunity and time to get in touch with Laci before he went fishing. He messed up! One single call to their answering machine, leaving her a message he was going fishing, would have sufficed, ESPECIALLY if he knew she was dead, and wanted to set the stage for his alibi.
But he couldn't do that, because he probably only had his CELL phone, which would have disclosed his location. He even went so far as to say he left his cell phone in the truck while fishing.
I've been hoping so much that little Laci didn't know what hit her. The thought that her last sight in this world was of her husband doing something to her is just too sad for words. I hope she was unconscious quickly (IF this is what happened to her....just speculation here).