You could try using wheatboard in lieu of particle or mdf or melamine coated particle board or whatever. Wheat board is environmentally friendly and uses no formaldehyde in the binding process. I Know of some homes in California that are being built using wheatboard for cabinetry.
Thanks for the info.
The day any van conversion company uses wheatboard or real wood in their production, they will be very busy with orders, AND making a better choice for the Earth and the van owner.
I approached SMB to create a "grren van" mainly the interior, and they were open to the idea, but not trying to make it a reality.