Sorry for the late update, everyone.
This ended up taking a lot longer than I anticipated, mostly due to the number of wires I had to run to intall all the cameras and because the fascia I got with the canbus does not fit the Dudu7 well - I had to trim it in multiple areas with a Dremel.
The issue I was having with the head unit not going to standby properly was fixed after I selected the correct canbus module within the settings (I had already set it to go to standby instead of shutting down - as suggested by Mihai - but it was not wowrking properly).
So, yeah, very happy with the unit, the fascia + canbus box + wiring harness are a must, since Mekede does not have anything Ducato specific, but once those are sorted it's worth the effort, especially if you get 360 chip and cameras like I did.
I will try and post a couple pictures in the next few days.