Typically we've been away 2-3 months per year, but never more than about a month continuously.
Very few things have changed, the layout still works, we've added a gas tank to replace bottles, the solar has been upgraded twice. the batteries have been replaced twice and we changed the bed mechanism after experience, but at first sight everything is the same.
So for us, this layout, and van, works.
There's a section at the side for what went right and wrong over this time, just for things to take into account.