The factory plastics are mounted with quite a few fasteners. Most of them are the same - hex head 4mm thread I think. Not too sturdy, but since there many of them, I think they will hold a properly designed fairing just fine. They screw into metal threaded inserts in the frame. I think one can easily add some more inserts if needed, but I would not go overboard as to not make a Swiss cheese out of the frame. Perhaps a couple of bigger bolts can be installed on the front and top of the frame where there is extra material to support them.
I've stripped all plastics off my SR (other than the tail and the controller cover) to check for lose connections. I did not find any suspect connections. There were two or three cables and connectors that I thought could use extra cable ties - they were not well secured and I'm sure would rattle or rub from vibrations - so I tied them-down before reassembling.
The charger being mounted under the battery, fully enclosed in plastic, and without any active cooling, I thought is not a very good design. The charger does get quite warm when charging even in cool weather. And I would think the battery enclosure above it is where some of that heat would dissipate from. I lately place a room fan near the bike to blow at the charger when charging to keep things cooler.