I am doing a custom case for the first time, and the case is all plastic, do the standoffs I use for the motherboard need to be conductive to ground the MB or does it not matter as long as the bottom of the MB is not touching anything?
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just use the standoffs included. the standoffs should be made of a metal
I belive it dosn't matter about grounding them. I have seen several acrylic case's which appear to have isolated standofs.
Plastic is not conductive so it does't matter. However I suggest you epoxy the standoffs so when you screw in the motherboard, you're not just spinning the standoffs in their holes from overtightening.