Most of the folk on TMP have suggested the gasbags need to be a lot larger. And, though I thought I'd appreciate them being some larger as well, I invoked the 'Major General Tremorden Rederring' defense.
Are they solid resin?
I opined a 'refit' with two halves of a cheap plastic egg and a tube, maybe just rolled thin polystyrene sheet, might do the deed.
I also admitted I'd never do half of what you've already accomplished, of course.
My basement, aside from the terrible pit that swallows old games and figs never to be seen again, is the pile of broken(incomplete) dreams(projects).
Doug