As redstone is not a feature in Minecraft PE as when this map was created KoolGhettoKid (the one who ported it) had to use redstone alternatives in the most clever ways to make it resemble the PC map as much as possible.
How to Download the Texture pack? Reply. Editor says
Результаты поиска по запросу "minecraft pe map editor pc": GTA San Andreas [Creation] | Minecraft PE Maps. The map was created a few years back as a survival hunger games map for the PC version of Minecraft but has since been ported to Pocket Edition.