If your doing imaging you should stick to the general rule of keeping the scope weight to 2/3 to 3/4 of mount rated capacity. I have a NEQ6 Pro and image with it through my 10" imaging newt (which I built to keep the weight down). I would not put a production 12" newt on a NEQ6 for imaging but you might get away with it fr visual only use. I would recommend an EQ8 if you want to image with a 12" newt.
I believe there is a company in europe that makes carbon fibre tubes for people to swap production scope mirrors into and these do weigh less but they are not cheap. If your good at making things you could try to build a truss 12" and that might get you under the NEQ6 weight limit for imaging but its mostly the mirror weight that's the problem. A light weight 12" mirror might be a good starting point.
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