The law here in NZ is that to be able to free camp or use any of the dept of conservation camp grounds the van must be 'self contained' hence you have to have a grey water tank as well as fresh and a chemical toilet or sewage tank. The plumbing has to basically be up to domestic standard as well. Its a bit of a pain and a added cost but makes for a much better result in the end.
I am quite pleased with how the interior is turning out overall. The benchtop will be solid 500 year old Kauri planks. A native of the north of NZ and now prohibited from being felled for timber. The only source being recycled timber.
Well...alright then, maybe just a little...