Update!
Thanks for the interest guys! Looks like it's worth going ahead with after all.
For the moment I'm happy with 7 people. Any more may be a bit too crowded at the moment. Also, it would be good to practice on members first! :)
If weekends seem to suit, thats great.
So far I'm thinking 4 classes to produce your raw plaster cast, and a 5th class for finishing it with a patina.
If you are willing to put in a class on both Saturday and Sunday then I guess we can get everything done in 3 weekends.
Most of the work will be done on the first day over about 3 and a half hours.
Remaining classes will vary between about 45 mins and and hour if all goes well.
Also, I imagine materials fee will be somewhere in the region of €6 to €8, I'll post it up when I've sourced it.
How does that suit everyone?
@Domhnall: the plaster will air dry, though it may take some time. That would be the main purpose for spreading it over a few days. Though we could help it along by baking it in an oven.