Thanks for the comments. Some more shots from this weekends work. All the stone work is painted and have started on the doors, etc. Also been experimenting with layouts and I am pleased with the flexibility of it.
The smallest castle

One with a great hall

Two baileys

Some paint on the roof and a start on the doors

As you can just about tell some of the doors I have mounted on a piece of paving to make them flexible in position so I don't need to use the gatehouse and can fit doors to the wall walks where needed. Unfortunately the gaps are not equal on the three bays on the towers so the doors supplied don't fit on the outer ones. Will have to shave a door or two for those. I have also made a small landing for access to the keep which is removable as well.
It also had it's first run out this weekend - a simple game with my 8 year old and some chaos marines fighting it out over the castle.