I have started the long process of texturing and painting the Dendermonde walls. The techinique is to coat the structure with a thinned coat of PVA glue and then to apply a single ply of tissue paper to it.
Then you paint another layer of PVA over the top. This produces a textured surface that can be sprayed grey and then dry brushed to highlight and bring out the texture.
I use cheap "Saxon" 2-ply tissues from Aldi which are large and easily separate.
The end result when dry is this:
City walls are done and most of the Ravelins. Next up are 2 Demilunes and then the 3 Bastions. I need to cut some window and door frames for the city gate before I can texture that and also need to tile the roof.
The effect once painted is shown on the sample ravelin here: