Need help reverse-engineering this UFO

I've become obsessed with the UFO in this Lego Ideas submission and I am desperately trying - and failing - at assembling the skeleton and then how the external skin is attached. https://beta.ideas.lego.com/challenges/39f467a4-3086-4d13-8603-fa37b45d1280/entries/1821371b-d02d-4a34-a07a-224d75ffe105 I know this may eventually be released if it makes it through all of Lego's internal checks but would love some help or ideas of tackling the craft. Image 2 is my attempt at an initial skeleton but...