how to model a scissor lift in catia?

I have been trying to model it for a week now the model does not seem to work, i have to submit it by next week , please anyone who have done this or know how. I need help in making the constrain right so that the dof is upward. My design is somewhat flawed and i dont know what is the problem. I need the scissor lift to work as it should. Thank you.

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