Here’s a tutorial for modeling a wooden blockhouse / fort.
Modeling
Modeling Wooden Pallets
Wargame News and Terrain has a tutorial on modeling wooden pallets
Basing Figures On Washers
Here are some great ideas for basing figures on washers. This is exactly the technique (and the same fender washers) that I use.
Making Rocky Terrain From Wood Chips
Here’s a nice tutorial on making rocky terrain from tree bark chips.
Making a 15mm Graveyard
Here’s a tutorial on making a graveyard for 15mm scale figures. It could easily be scaled up, though.