To be fair, the internal frame of the upper structure is steel. http://i.imgur.com/JLIlRf3.jpg http://media.details.com/photos/5637e54e62b3b75f2bb3e531/mas...

Isn't it a little strange to be comparing plywood with 3" teak? Can you even get sheets of teak that aren't a veneer? Wouldn't LVLs or glulams be a more apt comparison?

If you're just worried about looks then theres a lot that can be done around the plywood to make it looks better.

> Show me 100 year old (or 200 year old!) reclaimed plywood and you'll have made me a convert.

You can buy 200 year old teak. There are plenty of wooden buildings around the world that are multiple hundreds of years old.

When plywood is shown to last 500 years without breaking a sweat, then I'll believe it's a great building material full stop.

For $500mm it should be built to last a millenia. I know it's not, but again, engineer brain.

> When plywood is shown to last 500 years without breaking a sweat, then I'll believe it's a great building material full stop.

I think it's unlikely you'll need it to last that long.