I like to make my own boxes so they have a costum fit. I have never made a square or rectanagle box yet. They are very easy to make and it makes you all warm and fuzzy inside when you can say you did it all yourself. And not to mention your wallet stays heavier.
Taken some measurements, all will fit. By the looks of it, I prefer the 2nd and 3rd one. 2nd one is the truck one and will fit along the back, will take up lots of width but very little depth. 3rd one will take up roughly a 1/4 of the trunk with the corner gone.
personally I think a prefab box is ok, somthin from q logic, expensive but ok if you can match the recommended volume. Building your own would be cheaper and better but hard, personally I dont have all the tools to do it so It would cost me a lot more money to build one than buy one lol.