I still got the concern, some people use "plaster board" as synonym for drywall or the trade name Sheetrock. It does not have the proper paper face needed to plaster over.
Other people use "plaster board" for blue board or other panels made for veneer plastering.
So if you are going to plaster, do not do it over regular dry wall. And, I still fel that tape and bed is easier for most DIYer's than plastering. You can skim coat drywall with mud and get a plaster look. The mud drys slower, you don't have to work as fast, and it is very easy to sand smooth if your trowling is not smooth.
No need to double panel walls. Do you have a table saw? You can rip 5/8"" strips from 2x and nail over studs, put 5/8 sheetrock over that. Rip strips from 5/8 plywood, they don't have to have consitant width or even straight sides. Cut strips of 5/8 sheet rock. nail 1X2 furring to studs and use 1/2" sheetrock if you are willing to have thinner panels. Some of the cheaper, rougher cut 1X2 furring strips sold at big boxes as furring are actually closer to 5/8 than 3/4.
Or use 1/2" plywood furring and 3/4 sheetrock. Like I said that's heavier than what you're using.