Hi Nik, been down this path myself. There is a camper conversion place in Melbourne "Shiralee motorhomes" and a 2 seater / bed will cost you $5000.00 plus the cost of a ply floor also. $600.00 from memory.
I built my own having made several for bay window vans over the years . I have a 3 seater folding bed for sale to suit a T4. You should find it with pic's in the " parts for sale " T4 folding seat.
Tombi
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