But a lifting roof like this offers immensely more room inside the camperIf I would have to do it, I would create a lift roof!
Like this one: http://unicat.net/de/pics/BS6KD-2.html
Makes it way easier to fit into a shipping container, better fuel economy, no exposed windows while driving (scratches and stone throwing kids) and better while offroading in dense forests or narrow streets (with balconies!).
Just a thought!
And you don't lose very valuable storage space near the roof at head level. In mine there are 9 small cabinets used to store kitchen things and clothes. And my "closet" is used to store tools, travel books, parts and computers so the room at the top is the only place to store clothes etc.
My greatest shortage is not GVW, like many other campers; but storage space.
IMHO there is little hope of fitting a Mog into a container.