A new Wood scaffolding found under Decor / Sculptures, costs 0. You need World Adventures ( or a later pack ) for the scaffolding to show up in your game.
Wood scaffolding V2
Quinn's shack ( Makatea )
PS. I wanted to create a completely different looking shack ( sort of an elegant shack ) for my Island Paradise and the wood scaffolding just seen to do the job. I had to create the inside walls first and then place 4 wood scaffolding units around the walls creating an open plan ground floor with 2 sections. The upstairs is for the bedroom (s) and a toilet.