I thought of something else too because I also have the vault on my order, you may have difficulty getting a plastic tray into the box and if it does fit in it will probably have wasted space around it. I was considering not putting the vault on my order and installing it myself. I watched a video on it and I think the last step to installing it is the top frame and door. If you wanted a tight fitting organizer tray on the bottom, you could take off the top of the vault to put in a bigger tray but you'd have to do that again to remove it.