I will echo Mark's sentiments. While I love the look and feel of quality wood products, I do not believe they have a place in an expedition vehicle. Wood will always be heavier than a comparable composite for its size and it must be maintained in some way (oiled, sealed, painted, stained, etc) Wood by its very nature, rots, twists, warps, holds moisture, expands and contracts due to temperature and humidity, bugs like it, catches fire, etc.
Contrast that with aluminum or composites like carbon, kevlar, honeycombs, etc., and all of those issues go away. Maybe it does not matter in a 14 ton Unimog, but weight considerations are always important IMO. If you "add lightness", it will pay dividends everywhere (MPG, braking, acceleration, cornering, carrying capacity, tire life, etc)
This was brought to my attention recently, while viewing a video from a couple buying their first sailboat. They were initially considering 10-15 year old boats in "good condition" that needed a little work. After seeing the amount of work required to bring most of the boats they looked at, up to snuff, they ended up buying a smaller but newer boat that was a bit more expensive than their original planned budget. The boat purchased, however, needed almost zero repairs, So, they saved a ton of time and money on that side and were able to start sailing almost immediately.
Most of the repair work needed was wear items, i.e. sails needed to be restitched, wood was rotting, weatherstripping was peeling and leaking, poor quality DIY electrical repairs redone, poorly patched or constructed fiberglass needed repair, rusty screw holes, snaps that pulled through canvas, zippers were cracked or leaking, etc.
Especially in a marine environment and I believe that Expo use is not far off that, products should be designed for "hell"; they should be long lasting, and easy to service. A higher quality product with a more expensive upfront cost, should outweigh cheap and easy. Costs per mile or hour considerations should be figured into the build or remodel. Design it with the parameters above in my and items like wood, snaps and screws, are replaced by far superior technologies.