Welcome to the forum.
The Melbourne is a great unit built on the Mercedes-Benz Sprinter chassis. I own a Sprinter passenger van and absolutely love it. I suggest however that you familiarize yourself with the Sprinter before you make your final decision. They are amazing vehicles as I mentioned. However, there is somewhat limited service availability compared to comparable GM or Ford chassis (my closest Sprinter service center is over 50 miles away from my home and the next is almost 200).
Good luck with your final decisions and let me know if you have any Sprinter questions.