I have attached the pieces that kind of lock the inner, sliding frame to the outer frame, hinged the base to the frame, installed the wheels on the base, and now have the easel standing. I have clamped a temporary back brace on it while I make the permanent ones. And I still have to make all of the parts that will go on the center column (sliding canvas supports) and get all of those parts attached.
But it’s standing! Yay, me!
Not sure how much progress I’ll make the next couple of days as we’re getting ready to host a family get together, but getting it to this point is definitely exciting.