With our Explorers we have demonstrated a simple snare, sprung snare, platform snare, deadful, spear trap and bow trap. I usually set them all up first on a trail through the woods, and talk them through each starting off with the simplest. As we go through the woods i point out good locations to site them, animal runs, badger sets etc. At the end of the session they have about 20 mins to work in pairs and set up a sprung snare. If time is pressing, you can pre carve the trigger mechanisms etc, or at least put the saw cuts in for them to carve up to.
You may find that the figure 4 is a little fiddely for demo purposes.