Barking Irons put up a how-to terrain making article on their website. Check it out.
From the article:
Barking Irons is proud to present for your enjoyment this month’s modelling masterclass by Tony Harwood.
Once more casting his eye to the frozen North of the Witchlands, Tony shows us the step-by-step construction of a 28mm wooden shack. Designed for Alternative Armies Flintloque, it would look grand on any fantasy gaming table.