Man what a full on two days that was...
This is going to be an update of very few words as I am just so sleepy after a full on couple of days.. In a nutshell I got the windows and doors into the habitation box and fitted the new exhaust by routing it under the truck rather than up out of the top where it was before.
Now the habitation box can be lifted onto the back once the last bits of trim are fitted to the edges.
Let the the video do the talking while I catch up on some sleep.