Thanks to everyone who has commented! Greatly appreciated.
The layout seems unanimous, and I agree that it looks to be the bst way to enable the kids to have their own space along with a space for the adults. My intention is to get as big an awning as possible, as space is certainly something you cannot have enough of! We would then use the awning as a dining/seating area.
I suppose the one question that has not been answered is:
2/. How much to spend? (New-ish Vs Older) I know this is a million dollar question, and the prices vary so much. I suppose