It looks good to me Glenn, and I agree, silver plastic is a right ache in the anus!
I use an old point from a pair of geometry compass, sharpened slightly, fitted into my pin vice, and also use the edge of my razor saw. I tried those small scribing saws, but my hands are too stiff and lack articulation to be able to control them properly.
BTW, I'm hoping to 'win' a Revell F-84F on 'e bay' - should know tomorrow afternoon.