Worked a couple of mornings on the wing frame. So far I've completed the two cross-member base pieces including locking caster wheels and their stanchions. I also cut the four, 4-inch-wide carpet strips that will eventually support the wing. Next, I'll need to cut the bottom 4x4 and top 2x4 to length and use them to connect the two cross-members.
First cross-member complete with wheels.
Two completed cross-members with vertical stanchions installed. Carpet strips in front.