Suggestions for surgical practice for students

Hey, we (the students) are organizing an event called "Surgical courses" in our university, during which we introduce other students to surgery and help them to improve their surgical practical skills. So far our courses consisted of:
- surgical knot tying and sutures (simple suture, running suture, mattress suture and so on). Done with real expired sutures on sponges or pig skin.
- basic plastic surgery techniques - z-plasty, skin flap, rhomboid and others. All done on chicken skin
- Vascular surgery techniques - anastomosis "side to end" and "end to end" on synthetic vessel substitutes
- Abdominal surgery techniques - side to side and end to end anastomosis using pig intestines obtained from the slaughter house.
As you can see we are mostly using the materials that we are able to acquire ourselves and do not have the access to expensive surgical simulators etc. So what I am asking is:
Perhaps you could suggest other ways to simulate surgical procedures and improve our practical surgical skills. What are other surgical procedures that are possible to at least partly simulate, and from other surgical fields as well (neurosurgery, traumatology etc). Are there ways to cheaply create some sort of laparoscopic simulators? Are there some sort of exercises for surgeons/residents/students to develop and improve their hand dexterity/motor skills?
Your help would be appreciated

Do you, as medical students, actually have the skills to teach this stuff to other students?