They were either way too modern, way too short, way too flimsy or way too much glass and metal.
When the 18″ pipes are in and flanges are attached, flip the cart right side up and screw in the flanges to the top of the middle shelf.
After the middle board is attached, and the flanges are securely screwed in, screw in the 12″ tubes.
Attach the top flanges, screw in the glassware rack on the bottom side of the top board and place the top board following the steps above.