Liam Keegan, 17, was electrocuted while working in his shed on March 23
More than 400 people gathered at Tullawong Primary School for his service
One of Tullawong State School s captains, Liam was also an army cadet
Students wore tradie and cowboy outfits to the party for the young man
Mourners covered his casket in silly string as it left the service on his tinnie