Assembling one of the biggest monsters that ever lived is all in a night’s work for this guy.

And to blazes with the instruction manual.

Peter May and his team of three just erected the life-size cast of the mighty Futalognkosaurus that’s to be part of the Royal Ontario Museum’s Ultimate Dinosaurs exhibit this summer.

They started just before midnight Thursday and — with the help of a crane, fork and scissor lifts — the last bone fell into place at about 9 a.m. Friday.

“It easy when you’ve done it before,” says May, owner of Research Casting International in Trenton, Ont., which created and installed the 17 plastic/fibreglass skeletons that are part of the exhibit. “There’s hundreds of bones in the Futalognkosaurus (FOO-tah-LONG-koh-SAWR-uss), but we built it into just 18 parts which makes it a lot easier to put together.”

May says they’re so familiar with their creations after working with them for months they don’t need any type of guide except their sight.

The Futalognkosaurus was one of the largest land animals to have ever walked the planet and measured between 32 and 34 metres (105-112 ft.) long and weighed up to 40 tons. It lived during the late Cretaceous period in what is now the high, dry plains of Patagonia, Argentina about 88 million years ago.

Bloor Street took centre stage for a while as parts of the creature were unloaded onto dollies from a truck with a small but curious crowd taking photos on smart phones and emailing to friends.

“Wow . . . look at the spine, whatever it was must have been huge,” said Carol Stayner, visiting from Washington D.C. “This is street theatre at its best.”

This collection of dinosaurs consists of relatively new discoveries and go by such names as majungasaurus and ouranosaurus that were all unearthed in the Southern Hemisphere.

“What we have here is one of there largest and most unusual collections of dinosaurs ever,” says David Evans, associate curator at the ROM. “This is going to be an incredible educational experience but I have to say it’s also one of the funnest and most family-friendly exhibits we’ve ever put on.”

The exhibit runs from June 23 to Jan. 6 and includes fossils, real dinosaur skeletons and an innovative electronic component.

The balance of the exhibit was shipped and installed at the museum during the past two weeks, with the Futalognkosaurus — which will reside permanently at the museum — the last to join his prehistoric family.

Measurements and casts of the bones were made in their native countries (in many cases, the fossils aren’t permitted to leave the country of origin). They were then brought to life by Research Casting International which created the plastic/fibreglass skeletons with precision instrumentation.

May has created replicas for museums in cities such as Berlin, New York and Tokyo.

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But perhaps his most famous works appear at the end of the 1993 thriller Jurassic Park, when the characters of Drs. Alan Grant and Ellie Sattler — while escaping from the velociraptors — dangle from the suspended skeletons of a tyrannosaurus rex and an alamosaurus ultimately reducing them to a pile of bones.

For tickets and more information see www.rom.on.ca