Is that a picture of a 0.1uf capacitor?
No but then I don't actually say it is. For the eagle eyed it is in fact a 10nF or 0.01uF which will do just as well. 
In protection , one of the catcher diodes seems to be round the wrong way
Thanks you are right, just goes to show how you can't mark your own homework all the time. Now corrected.
Just had a thought on the I.E. memory usage, maybe it is to do with the font I specified. Just a thought.