Yep, they are a new growing segment within the industry...prefab campers in kit form, they are ment for the DIY person.
There is another mob called liberty Camper, who sell hard floors in kit form.
www.libertycamperspty.com, the kits are ready made, but are manufactured off shore...China, shiped out to Australia. This saves the importer heaps with duty taxes and such.
They will assemble the kit for you for a price.
If you are good with the spanner and can spend the time assembling these things...The full kit is about $20K depending on the options you want to add, but the catch is, some parts are not up to ADR standards, if you assemble the kit, there will be warranty problems if things in the prefabed sections go pear shaped.
Good luck.