On the subject of cost, the two models that I have canibalised were £17, and wire rope, hooks, and blocks came to a further £20. That’s quite a lot for such a small model. I reckon the locomotive and rolling stock will cost around £100, and there will be furtheer costs for detailing parts.
Here’s some information on the operation of the armed trains, from the foresnsic Report of the British Naval and Military Operations in Egypt, 1882 (p182 onwards):
|The modified gun and carriage with components ready for assembly. The blocks are slightly overscale, but will work, I think. Rigging the blocks will be a challenge …|