I mean the thread, what thread do you use for the radio cables and railings.
On second thought after looking at your pics in photobucket your type XXI's rust is a bit wide(each rust stroke you made is a bit wide, use the slimmer side brush as rust tend to go long but not wide) but then again it's a matter of taste. She's brand new when the war ended so perhaps a little thinner/slimmer rust will do. But still a showcase piece. Better than most sub model i've seen on the web though obviously there are those insanely perfect models.
Make a display case for her to put in your selected room. Don't let the dust to settle in.