With scale 1:28 you are getting close to first falcon movie model "5footer" (cca 164cm lenght). It is cca 1:21 scale.
Please consider making it in this size
. It would give the model interesting label
"original movie model scale (studio scale)". And it coud have positive impact in auction. And it will be first paper model that big of millenium falcon. And you will became famouse and rich and stuff like that (Disclaimer: I am not trying to very inconspicuously and subletly persuade you
)