Installing drywall over fiberglass reinforced panels

Hello - I'm wishing to remove the current drop ceiling from my uninsulated, seasonal cottage (NY) and cover the existing rafters with tongue and groove pine. The cottage can grow very hot sometimes in the summer, as the (metal) roof is not insulated. The rafters are 2x8's, and I'm not sure that I would have any room to insulate plus use vent baffles between the insulation and roof. The roof is flat and is pitched at a slight angle from front to rear, with soffit vents on both ends. Just wondered what my options might be if any, thanks very much, appreciated. Pictures of ceiling, showing front and at mid-cottage wall (I would only be adding the tongue and groove the mid-cottage wall, back ceilings are small bedrooms and would remain as is with drop ceilings.)

We recently remodeled our bathroom, which was a very messy process with lots of plaster dust. I had been told by an inspector previous to the remodel that the walls were just normal animal-hair plaster, and not a concern. After the remodel was complete, I started getting anxiety about it, and decided to have some samples in my house tested just for future knowledge, and if we remodel anything else. I sent out various samples from around the house, plaster walls, plaster ceilings, attic insulation, and textured ceiling paint (NVLAP accredited lab). All of the plaster and insulation came back negative, but the ceiling sample came back positive for 2% Anthophyllite...and now I'm freaking out a bit. I spoke with the lab on a consultation call, and they said the ceiling should not be a concern as long as it's not disturbed, and we could plaster/paint over it to encapsulate it. I told the person that have cracks in that part of the ceiling though, and if we should be concerned. She said we should probably have an air quality test done. So now I'm in a panic to test our air. This ceiling is only in one hallway (other ceiling samples tested negative), but it is the main hallway of the house . Dust and debris are not falling from the ceiling, and we never touch it...but there are some pretty big cracks in the paint that reveal the plaster layers underneath it. We have been living in this house for 5 years now, and the ceiling has been in basically the same condition the entire time. I understand all forms of asbestos are toxic, and there is no acceptable level. But I'm looking for advice on how concerned I should be about this level of exposure. I don't plan on removing the ceiling at any point, and just want to encapsulate it. Is it enough to just paint it? Should I use a roller or a sprayer? Should I plaster the cracks first? If I use plaster, is there a concern of disturbing the paint as I apply it? Obviously I won't be sanding or cutting it...but will incidental contact with wet plaster do anything? Will a strong breeze through the hall do anything? Any information is appreciated.