these tips are easy, no curves.
film the wing, leave about 3-4mm overlap on the tips, then simply slice some film on the front curve ( this allows it to conform to the D shape curve, cut from the wing edge, outwards in quick straight lines ), the back is ok apart from the back edge which will need two slices , then simply roll the iron off the wing onto the tip edge taking the film with it. then cover the tip in balsalock. now use some scrap from the wing and just iron it flat on the tip. use a knife blade laid flat on the wing to push through the tip film, then drag the knife along. seal the edge with prymol
job done.
all other tips are either a varitaion of this, or covering the wing it's self, ie for Cougar style tips.

did considerer smoke, but with the fuel problems i decided not to.