Spector

My wife acquired a quilting frame years back. She was told it was complete. She now wishes to use it, but we cannot figure out how to put it together.
The attached pictures show the pieces she received and how I guessed at their assembly. All pieces are wood. Three pieces of similar size & color created a U-shaped stand. The other pieces created scissor frames. It appears to me that the U-shape is not part of the same group. It also appears to me that there may rails missing that somehow attach to the tops of the scissor frames.
I did buy two 1X2 - 8' to fashion into rails, but I am not certain how to proceed.
Does anyone recognize this frame and able to give me some direction?
Thanks,
Allan