An indoor mini golf course made with Bunnings items such as plywood and plastic piping.

The project
I haven't included plans, but this was built using items purchased from Bunnings and the original design was sketched out on a bit of paper.
My kids wanted a Holey Moley course, and I wanted to add some fun options to the upper deck and make it random where the ball came out. We added different obstacles to the decks to create different challenging holes. We also bought glow ball golf balls for night-time putting.
I included this video to show how it was done.