Hey Neil, we just used your idea, although we adapted it a bit. We used 2 1X4 boards and placed them on a 2X4 that was nailed to a board and placed on top of a 15 inch tall box.(this was easier than lugging sawhorses to the church) I copied 2 coloring book pictures of Zacchaeus and taped them to the end of the boards (with cardboard behind for support). Then we taped a plastic cup next to Zacchaeus. We made sure the boards were nice and level. We used coins instead of the "prizes" since Zacchaeus was a tax collector. Whenever a team answered a question correctly, they got to put a coin in the cup. Object was to get Zacchaeus to come down out of the tree to meet Jesus. We used nickels and quarters. Kids could choose a "life application" question that required more thought if they wanted to add a quarter rather than a nickel to the cup.
Great idea! Thanks for sharing!