I've been thinking along the same lines. Have had mine for about 3 years now, there's nothing at all wrong with it, it flies great (.61FX) but I've got an itching to fix something that ain't broken. I think I got the feeling to overhaul it after coming across the USRA website http://www.usrainfo.org/ and being inspired by some of those awesome planes they have in their gallery. The ouline of the Shoestring is alot like some of the planes on that site so I might come up with my own USRA scheme.

Have you taken the covering off yet? If so, are you thinking about any modifications such as a sheeted turtledeck or fully sheeted wings? Also, do you know where I can get a 2 view of a GP Shoestring? I always like to figure out the trim scheme in Photoshop before I start covering so I don't wind up with a painfully tacky airplane.