A big thanks to Joseph Hartman, San Diego, California for making me aware of his blog. He's trying hard to accomplish a similar project to myself using Ubuntu and LTSP. Just like me he's coming across many obstacles and one by one he's managed to overcome them.
He recently posted a great metaphor for his reasoning in using FOSS:
Understanding Operating Systems through the metaphor of automobiles
His full blog can be found here:
Hartman's Blogtastic Blog
I'd sure like to hear from anybody else who's doing a similar thing to our two primary schools, as they say - many hands make lighter work!