A little more progress: I am pleased with these.(pics taken on my phone so sorry they aren't quite as sharp as usual)
Finished Wall Section
Finished Wall Assembled to a WIP Tower & Bridge.
The upper sections of these pieces matches the colours of my existing buildings. The lower sections have small stones PVA glued to the sections and painted to resemble flint covered stone built sections. I hope this gives them more of a rugged appearance than the basic buildings but still looks more like a stockade than a stone fortress/castle.