This is no where near the truth. There are no cases today of someone constructing new animals out of skeletons of several other animals. Dinosaurs are real. It is not easy to summarize this info. The best source I can find and have time to type because it is one paragraph comes from a recent book The Horned Dinosaurs by Peter Dodson.
Horned dinosaurs have one of the best fossil records of any group of dinosaurs.
There are close to four hundred specimens in museum collections around the world. There is an average of more than 30 specimens per genus. Even if the extremely abundant Psittacosaurus and Protoceratops were eliminated from this tally, we would still be left with a respectable 9.4 specimens per genus, which is well above the average of roughly 7 specimens per genus for all dinosaurs. Where the fossil record of horned dinosaurs really shines is in completeness of material. By contrast the giant sauropods have a fossil record that includes some 45 genera, fewer than a dozen of which have skulls and only 5 of which are based on complete material.