the trunk floor you can make work with a little fab work, challenger trunk floor has fuel neck for the gas tank on right side and cuda from the rear, if you carefully cut the opening in the trunk floor from each floor and switch to the one you need weld it in and your done,as for the wheel houses the outside wheelhouses are different from between cuda and challenger , not to mention you have to remove the top half of the mated wheelhouses and either fabricate or reuse the top of your original wheelhouses.