Thanks for the advice - I admit I was lost in the depths of the Unseen message board looking for somewhere to introduce myself being a complete newbie. I have started to find my way around now.
Thanks for the help and good luck with your castle. If you want some good examples of castle ruins for inspiration you should visit the castles of Wales. Some lovely mouldering piles in stunning locations. Look up Carreg Cennen Castle or Dolbadarn Castle on the web to see what I mean.