It's been awhile since I was able to set up the puppy swing so last week Ian solved the problem by making us a permanent structure under the canopy. The pups found it rather a nice place to nap and I got to spend an enjoyable place to sit and watch them.
The first video is of the pups at 5 week old with it low to the ground to allow them to get comfortable with minimal movement.
The second video is of the pups at just over 6 weeks old. As you can see the increased height and movement doesn't phase them in the least!