The Lithgow artist created two steel structures based on Indigenous shelters, to feature at the new Sydney Zoo at Bungarribee near Eastern Creek, opening later this year.

Mr Spark has been crafting metal works for 40 years and said he was proud of his newest creations.

"I worked for Ric McConaghy, who helped design the Adventure Park on the highway, we've done a few jobs together and he asked me to make these two [structures]," he said.

The structures are made out of steel and based on Indigenous shelters, according to Mr Spark.

"They're both made out of square steel and been hammered to give it facets, which gives them an interesting texture, they have a wood-like theme.

"The joints are wrapped and have been through a power hammer which makes it look a bit funky," he said.

He said children could also climb on them because they had been tested and were stable.

"The kids can also make a cubby out of them, eventually the structures will be decorated with leaves and branches," he said.

Mr Spark said he lost track of time making them and it was a long process.

Read more:

"It's often longer than you think it's going to take. There are 140 wrap twines on the structures, you make one, two.. they look good, then you realise you've got 100 to go.

"But, you do the job and you get quite involved, sometimes you even wake up at night worrying about it," he said.

In the past Mr Spark said he would cringe if he saw something he made that had been a "nightmare".

"They can be hard to look at if you pass it every day but most things you make get sent away. Candle sticks for example.. I've never seen them again since they left my workshop.

"These ones [structures] though, I like them because they worked," he said.

He said being in his State Mine workshop gave him the opportunity to create.

"This wonderful workshop gave me the chance to make these structures and I'll never lose the love of it because it gives me the chance to experiment," he said.

The structures will be transported on Tuesday, July 23 to the Sydney Zoo.