I know this post is super old, but did you ever get this figured out?(i'd have to somehow make the spring have motion w/in NX, but that's another problem...)
It will fit in a flat rate box, so no biggie. It's sitting there collecting dust whenever you need it.I'd say save the shipping at this point. If you're somewhat close to morningz, maybe he could bring it up to oktoberfast. This project is gonna be on hold for a while, so no rush.