Sorry for not replying have been very busy at work.
The Base is coraplast, the shell is mad from stack crates you get from Bunnings, the ramp is coralpast and the bunks from plastic vegetable stacks that you get from Harry's, the Boys love them.
Both ends unclip and the coroplast slides out for easy cleaning, the Polar Fleece has towels sewed under it for ease of replacing, and paper under that. Very easy to clean.
The Bunk is made from stackable vege racks that you get form Harry's, they come in a pack of four stacks, so you get 2bunk beds, I gave the other bunk to my Daughter for her Girls