This is fantastic. My hubby is a science teacher and used to have a knitted gut until one of the pupils stole it! He has been nagging me to knit another one for a while but my knitting skills are fairly limited and I didn't know where to start. Now I can't wait to get started although working out the instructions may take some time as I am a novice english knitter.
Also at the speed I knit my own kids (Aimee 4 years and Alice 4 months) will be in secondary school by the time I finish it.

Keep up the great work, I am off to buy some new needles!