The details in the picture tell me that only the hero unit is actually transparent and the rest are all transluscent and so the clearer stuff is perhaps vacuformed and all the rest are ghetto construction. So cost wise it changes across the display to get the right effect without the whole thing being the best materials and sparing no expense.
I have seen Allens plastic wrap and tape bodies and with just some imagination of applying some kind of decorative goo would detract from that. No one is going to judge that it is spot on movie reproduction, only having something jiggling in an egg will be the whole jist of the scene. Some moving toy with a little monster skin and the use of lights or lack of lights that the eggs are everywhere and this one or three something is happening.
Another fabulous post from the U.S.Department of Wild Imaginings, now in spectaclar stereo, sponsored by the Adhesives and Sealants Council, suggesting ways to stick things together since the 1800s. Not fabulous in a gay way. Your results may vary. Illinois residents add 8% sales tax. These posts have been made by professional post makers, do not try this type of posting on your own without extensive training, lovely assistants and a trusty clown horn.