Things sound to be coming together nicely, Mark, despite the problem of the mountain. What method are you using? Large sheets of crumpled strong brown paper brushed over with glue gives a fairly stiff form to paint on, horizontal surfaces green, others grey or brown. I remember using Gloy years ago on admittedly smaller OO scenery.
I will be over as soon as possible tomorrow. I had hoped to have everything packed up and maybe even in the car, but not so I'm afraid. Would you be able to bring a soldering iron and some solder tomorrow, Mark, please? There is a battery connection on a piece which needs soldering and my soldering iron is still packed somewhere.