You mean like this one for example?
Hm.... I love your process, but that one looks quite odd. For the original, you need to use the low-rez falcon, I understand that... but it seems you used a still of the low-rez falcon. The thing is... the small grain won't make it appear lifelike or part of the picture, especially if there are small hi-rez stormtroopers on it's side... is there any way to use the moving GOUT image for this thing, and not a still, or will it jump around the screen?
Maybe it would also be possible to loose resolution of the HD-image, so they fit better together.
Anyway, I believe it's more important to have the shot work in itself, even if the resolution is lower, then have the old elements stand out. I think you make marvelous work with the rotoskoping, but using still images can stand out very fast and call attention to the effect.