The tomato cage looks like it is incorrectly modelled.
The vertical legs should be either inside or outside the rings.
The legs can butt underneath the upper ring, but shouldn't coincide with the lower rings.
The alignment of components will actually depend on the method of assembly chosen by the manufacturer.
Drawing the cage in 3D should only take a couple of minutes.
The basket shouldn't take long either, there are only 5 pieces to extrude and copy.
To my knowledge there is no program to convert 2D to 3D for this type of work.
Is the basket you show meant to be stackable ??