STEP ONE:

Cut a rough octagon from 40mm thick polystyrene sheet to form the core of the hut. If you like, you can add an entrance using another piece of polystyrene, like the one in the example. Glue the core down to a base of corrugated cardboard, making sure that the base is at least a centimeter larger than the core on all sides.
Make sure you use PVA glue through out this project, as other glues will melt the polystyrene.

STEP TWO:

Now it's time to add the tent poles. First, use some square balsa to make the uprights. They should project about 2cm above the core. Use the same material to form the doorway. Cut notches into the uprights to hold the cross piece. Add a small piece of cardboard to the middle of the core, and add a single central upright to the middle of it. Now, use bamboo skewers to connect the outer uprights to the central upright.

STEP THREE:

Now it's time to add the canvas! Take a margarine or ice cream container, and mix up some PVA glue and water in it. It should be about the same thickness as milk. Add a few drops of dishwashing liquid to it. Now, take some ordinary facial tissues (not toilet paper), and fold them over a few times. Cut out panels the right size for the sheets of canvas. Dip these in the PVA solution, and then drape them on the core. Try to get the folds to look natural.

STEP FOUR:

When the glue is thoroughly dry (this takes a long time - it's best to leave it over night) you can start to add details. Here, I've added some icons from Orc shields, and the giant skull from the orc command sprue (minus the horns) Try adding weapons and shields leaning against the uprights, or skulls littering the ground as well.

STEP FIVE:

Under coat the entire model with black paint. Spray paint will melt polystyrene if it comes into contact with it, so to be safe use a paint brush.

STEP SIX:

When the undercoat is thoroughly dry, you can start adding the colors. Paint all the cloth areas in a tan color, such a snake bight leather. (You can use other paints if you prefer - I usually use student acrylics, which come in a wide range of colors and are very cheap). Dry brush the wooden parts with a dark brown color. Pick out any other details in appropriate colors, and Paint the base green.

STEP SEVEN:

When the Paint is dry, you can take it one step further to make it look even better. First, dry-brush the canvas with a light tan color, such as Bleached Bone. Do the same for the wooden beams with either bleached bone, or codex grey. You can do the same for any other details you've added by using a lighter version of the base color.

STEP EIGHT:

When everything is dry, Paint an even layer of pVA glue over the entire base, being careful not to get any on the hut itself. Sprinkle static grass over the whole base, and leave it to dry a little before shaking off any excess.