Brody Burgess's leg was severed during the accident 12 weeks ago, and it led to an amputation above the right knee.

The 18-year-old also endured the reconstruction of his remaining knee and is learning to walk again with a prosthetic limb.

As he has embarked on the rehabilitation process his parents say will take 12 to 18 months, he and his family have been buoyed by the support of the community.

The latest effort was a Halloween-themed fundraiser held on Friday night, which Brody left hospital to attend.

"He was happy to make it and humbled," mum Renee Burgess said.

"He shed a couple tears when people stood up and clapped him."

Funds raised were going into a trust account for Brody and they were appreciative of everyone involved, his family said Mrs Burgess said Brody was "very thankful to be alive" because "he very nearly wasn't".

The family also offered thanks to those who had "contributed to keeping our son alive", including the three people who had found him, with one going to call the ambulance service while the other two stayed with him.

"They tried to get him warm - he was hyperthermic - and took off their jackets in -2 degrees to give to Brody," Mrs Burgess said.

Her thanks also went to the police and paramedics and the staff of the Dubbo, Lourdes, North Shore and John Hunter hospitals.

Mrs Burgess said Brody's goals were firstly to get up and walking again, and then longterm to return to the workforce.

But the weeks since the accident had also given him a new idea.

Mrs Burgess said he'd like to talk to others who were having a hard time to help them out.

"Through his Facebook pages people have been saying how inspirational he is," she said.

"He doesn't feel like it - but I say 'darling it's because you're strong and you keep pushing on'."

Dad Kimble said his son did not ever seem to have complained about losing his leg. "When people ask me (how he is) I say he's very thankful for family, friends and life," Mr Burgess said. "He won't stop cuddling everyone."