Recycling timber into cabins

My mate Justin who lives in Canada
- with some of his demolition/reclaim buddies.

I asked what the timber was...

"It's 100 year old douglas fir. Goes hard like iron, but shines up like a penny with oil or varnish. I hate the shit. gives splinters. Much, much prefer freshly felled oak." (Freshly felled anything ?!)

Well done for liberating it - that's a good haul. Wear gloves.

He wants to use the reclaimed timber to build some cabins like this. The ones I liked didn't have plans available.

Anyone know any other websites with log cabins and plans ?