Thanks for the kind words, chaps. To answer a few points...
Crenallations. Not in this period. Even in the high medieval period not all fortified buildings would have crenallations. The owner had to apply to the crown for a license to crenallate. Whilst the larger castles would have crenallations many local manor houses wouldn't.
The rough texture. It's sand. Cover the area you want to cover in PVA and then sprinkle on sand.
The logs. No, not dowels. They're twigs.
The stone steps. No card involved. The basic shape was made from a block of balsa and then skinned with miliput and the flagstones carved in with a cocktail stick.