I have been able to move things on a little bit and now have a semi completed chimney, i forgot to mention earlier that some components like the chimney are MDF rather than plywood, anyway here it is.
The second picture sees it placed on the side along with the roof to gain an idea of how it will all look when finished.
Now comes the water proofing. I have for many years volunteered on a Railway in a particularly wet part of North Wales and as we all know wood, especially the modern kiln dried stuff really does not like water.
I was advised there that sealing everything with thinned varnish was the way forward, basically thinned down about 50% so that it soaked in and keep applying it after drying until it stops soaking in and sits on top like a normal coat of varnish. Some of my work there is now over 10 years old without any rot so its good enough for me.
I will treat various parts like this, the chimney inside out. the entire roof, inside the hut and the top and bottom of the floor along with the window frame. As the original was creosoted i will treat the outside with some wood preservative, possibly it will need re-coating every so often mimicking real life.
cheers for now, Rob