Hi Terry
We had those discussions as our two grandsons grew in size. Our eventual solution was to bite the bullet and splash out on a replacement new PopAir Awning that we could attach the zip-in annexe to. Only used once so far and it worked a treat in quite strong winds...........
But the discussions may arise again as they get bigger - their dad is well over 6 foot and they are really tall already for their age.................
Good luck with your Swift and hope it works out well for you all.
MikeT