It warmed up enough today to do some work outside on the changing room.
I started by sewing Velcro (
https://www.harborfreight.com/3-4-quarter-inch-x-35-ft-roll-hook-and-loop-cable-strap-96215.html) to lengths of Awning Rope (
https://www.sailrite.com/Awning-Rope-Black-Vinyl) and sliding the resulting assemblies into the channels at the bottom of the tent platform. I left the velcro long at the corners so it could wrap around and join the corners.
Then I sewed velcro along the top of the walls. The walls hang very nicely using the velcro:
And once the tent skirt is pulled down it covers the joint and will prevent water ingress.
There isn't any channel along the Jeep side of the tent platform, so using screws, I attached short lengths of channel (
https://www.sailrite.com/Flex-A-Rail-Black-44-Long) to the underside of the platform, leaving a gap in the middle where the ladder will lay against the platform when the tent is stowed.
I made matching lengths of Awning Rope, sewed velcro onto them and slipped them into the channels.
The back wall attaches nicely to the velcro:
The walls in place:
The leaves laying all over the yard were calling me to rake them so that's all I got done today. Everything done today was very simple straight-stitch sewing, very simple as long as your sewing machine is strong enough to punch through the rubber awning rope. All but the very cheap plastic sewing machines on the market today should be able to do it.
What's left to do: I have to hem the bottom so stiffening rods can be slipped in place, and install grommets in the bottom so if necessary the walls can be staked to the ground.
Also I need to trim one of the walls - there are 20' of wall in the package, and only 18' are needed, so where they join in the back there's an extra 2' of fabric.
I'll trim the zipper off the end of that panel, cut 24" of fabric off, hem it and sew the zipper back on. The great news is the excess fabric is plenty to sew a storage bag to store the changing room.
So far I'm very pleased with this project - it's inexpensive, it's easy to modify the canopy wall set into a changing room and it looks and fits great.