So far on the tower, I've constructed the base and sides of the observation platform.
It will be 3" x 2" (~75mm x ~50mm). The base is made from some craft sticks I've had for a while supported on some square sectioned balsa beams. The sides will be glued down after they have finished drying. One of my 25mm British naval officers is inspecting the platform's construction.
The zariba will be constructed in 2" sections to facilitate the game mechanics for setting it on fire, which will be the only way that the native attackers will be able to penetrate into the zariba. For those who don't know, a zariba is a thorn enclosure designed to seriously impede passage by man or beast - a "natural" barbed wire. My zariba's bases are large craft sticks with a section of foam core glued on perpendicular. I'll paint it sand-colored and then glue on the material I'm using as the thorn bush.
Here are the beginnings of the zariba with a couple of Royal Marine Light Infantry posed behind two of the sections. The idea for this construction method was from my wargaming buddy, Bill Hamilton.
More pictures to follow as the construction of both the tower and the zariba proceed apace.
Note: Soon to be posted on the Jackson Gamer's blog (link) will be a brief report and pictures of the first play test of the scenario for The Relief of Wadi Zoum-Zoum that we conducted last Saturday (April 17).