David, I know this is a bit late for this splendid model, but I've just been reading about a revolutionary thread that is being hailed as the answerer to a modellers prayer, it's called, 'E Z Thread' and is reputed to stretch 700% of its own length and return to normal. I've found it on eBay and they sell sample lengths so I'm going to give it a try.
BTW it comes in white, green, charcoal and rust.