Right now the basic observation seems to be that a tray, or group of trays, result in the horizontal construction of a floor of related levels. I'd like to see this changed to vertical construction of related levels.
With specialized gear, it makes sense to try to attack specialized levels. For example, you might want to attack all four slumber cradle levels in order. Or, you might go for jelly farm 1 and then jelly farm 2.
Right now you can't. The levels group horizontally, and the elevators will not take you horizontally.