Is it ideal to do veneering with zero overjet?

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I have gone through your query and attachment (attachment removed to protect patient identity). I can notice mild retroclination or inward inclination of maxillary or upper anteriors. So, ideally, before going for any prosthesis, one should achieve ideal occlusion and relationship of teeth (i.e., inclination of anterior teeth). As per your description, there is grinding or attrition of teeth, which needs to be treated and corrected first. Regarding zero overjet, that is not ideal. Ideal overjet should be 2 mm it in natural teeth or when thinking for any prosthesis. As per your description and attachment (clinical examination is necessary for final diagnosis and treatment planning), it is always better to correct the malalignment of teeth first and achieve ideal occlusion then plan for prosthesis if required. About improper occlusion and posture, yes, there is a relation between these two. When occlusion is not ideal, then ultimately it will affect the posture or resting position of the mandible, and many things are there related to improper occlusion of teeth.

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Regarding the duration of treatment and final treatment plan, one can tell only after clinical examination. As per view of general person, one can notice fault is there only in front teeth but same thing when you ask to specialist then he or she can see many of the problems in that so one can tell duration of the treatment only after clinical examination. And yes, bruxism or attrition of teeth is having definitive treatment. As when one is using any prosthesis or thing for particular duration then he or she become habitual for that over the period of time. I would suggest you to consult both prosthodontist and orthodontist, as it is multidisciplinary case and there has to be combined approach.