Feasibility of PCB edge plating?
If you mean solid edge plating (rather than castellations) then it's certainly possible, but you will have to ask your PCB house if they can do it. As far as I am aware it's not too hard to do, it's just not such a common requirement (good for EMC behaviour).

One of the few prototyping companies that offers this option regularly is PCBWay.


image source: http://www.eurocircuits.com/blog/Copper-and-the-board-edge/