As one of the instructors, I'd be delighted if you run the course based on our material, and be able to contribute back to it.
Very briefly regarding your other questions, here's some of what I've learned from the experience:
-- have material for those who advance quickly, but also for those who need more basic building blocks; plan for a range of backgrounds
-- attempt to have all necessary tools installed before the workshop; we couldn't come up with an ideal way of doing this, but during the workshop it proved a real pain to get everyone going
-- have the workshop in a place with reliable internet connection
-- Embecosm kindly sponsored the event and provided the DE0. Can you find a sponsor? Maybe ask people to buy one (beforehand or from you on the day) -- they're not that expensive
-- be explicit about what people may expect on the day when you advertise the event; some people may not be too familiar with the workshop style, and expect more of a seminar type of event
Sorry for the late reply, but this IS the place to ask these questions, so please keep the thread going if you need more input.