Thanks for your reply, Freds,
I have contacted the electronics and engineering departments, and I will see tomorrow what facilities will be available to the society. I will let you know what we have here.
ok for starting with the extruder. Now I think that, if we get enough finance, we may start with a ready to make reprap kit so we can learn how to mount it, and then we can try to duplicate it.
PS: I found it difficult to get information about the make of an extruder. I beleive that this page (http://reprap.org/bin/view/Main/ThermoplastExtruder_2_0) should be linked here (http://reprap.org/bin/view/Main/RepRapOneDarwin#Cartesian_robot)