Nothing fancy. An 8" x 5.5"(210 x 140mm) white box. Cut a 4" (105mm) archway on two sides. Cut out a rectangular window.Cut out a length of packing cardboard and, in this case, I used "No More Nails" high power adhesive. There are many types on the market but they all have immediate grip so you need not struggle keeping the cardboard in place. Also, as its not PVA (wood/Elmers glue) there is no buckling and I don't rate hot glue guns with this sort of work -but they can be used.
Some dry brushing on of colours and this meant the cardboard was not saturate and buckled but brought out an almost tile effect!
Front....I may weather the gates a bit with paint but they do their job! Notice the black painted bamboo scewers cover up that corrugated cardboard arch
The tower can be used as either a small, walled town's main entrance or even farm entrance. Even mid-bridge as a gate house.
When it comes to scale you might think this is far too large?
Now you look at that Hat Industrie Napoleonic Marine, which is 23mm (in real scale that's 1.66 m tall man). The thing you have to remember is that most 1/72nd or 20-25mm buildings are not in "true scale". The reason for this, manufacturers and gamers say, is that true size buildings would look massive in comparison to the figures themselves. Bad excuse in my opinion.
If you are into wargaming you probably have seen the classic Airfix Waterloo farm set?
Box looks great. As did the one for the Roman Mile Castle, Fort Sahara and so on. However, if you think you can set all your men up in one to stave off the French attack, or use it for any later conflict including the Franco-Prussian War and even World War One and Two....think again.
Look at this (and I apologise as I have no idea where I got these images from a good while back -could be the Airfix forum? But the first is from miniatures.de)
Richard Caldwell's Waterloo set up (not the farm but the church) and, again, no idea where I got this from. But look at the scale of the buildings compared to the figures. Yes, you do need more space to set these up but that's half the fun. I don't have an 8 ft x 4ft standard table but a wallpaper pasting table is large for my space.
The thing is, if you want to, and if you have the cash, you can buy MDF (hardboard) laser-cut buildings that you need to construct. There are resin buildings, too, but they do cost a great deal. Making your own terrain out of old boxes, polystyrene and so on is creative, relaxing (that I need) and fun. H. G. wells made wallpaper houses and put child's wooden play blocks in them for stability.
You make what you want with what you have got. These aren't going to be contest pieces or for display. They are for your game.
It is THAT easy. I can do so can you.