I bought a set a few decades ago and gave up after the first one. I gave them to a then-retired friend who spent "a few minutes" (a day, for a month) assembling them. What appealed was the fact that the ones I bought were the original Bakelite bodies, not the thermoplastic ones. They were the original black color and needed to be painted. Too much work for a lazy and unskilled guy like me.
The "assemble yourself" scam was brilliant: get the customer to finish the product. Sort of like the "pick-em yourself" strawberry farms. A friend claims that the next step will be "plant-em yourself".