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That's going to make the door very thick, and it may end up not fitting the recess, architraves or even frame. Plus consider fire risk. And you'd have to edge it, it's going to be quite a task. It is unusual to insulate internal doors, I realise you have a cold house but insulating external...

Is the space heated the other side of the door? If so all you will be doing is keeping the heat out of the room. If not then you need quite a bit of insulation to make a difference. If the door is really flimsy then polystyrene core or offcuts of Kingspan type material and ply on the...