Mario and Luigi: Double Trouble - Boxart

So I started thinking about this after I designed Princess Plum, and here's the official (well, as official as it can be for a fake game) boxart of what I'm calling "Mario & Luigi: Double Trouble" (i know, overused title, yippeee.)

The basic plot has Bowser somehow creating/stealing a Duplication machine. He kidnaps Peach (shocker!) and uses the machine to create a duplicate to take her place (introducing Princess Plum, who, for this part of the game, has the same clothes as Peach). The princess (currently known as Doppel Peach) takes the place of Peach, and when Toadsworth gets suspicious of her strange actions he calls for the Mario bros. While the bros. are distracted by Doppel Peach, Wario and Waluigi show up and decide to use the distraction to take Peach's treasure. When they get in, they find out that they're too late-- Popple has already stolen it. So now we have Mario and Luigi chasing down Bowser to destroy the Duplication machine, and Wario and Waluigi chasing down Popple to get the treasure. For most of the game,the two groups don't interact directly, but their actions affect the other team (for example, if Mario and Luigi get stuck in a cave, Wario and Waluigi might battle with a giant robot that, when defeated, collapses on the cave wall and allows Mario and Luigi to escape). There will also be a few choice battles with all four of them working together (including the final battle against a somehow more powerful version of Bowser).