Minecraft 1.5.2 Build Battle Map (compatible with Eaglercraft 1.5.2)

This is a Build Battle map I made to play with my friends, and I later decided to upload it to Planet Minecraft. It's pretty simple to play: start the timer, go to one side of the wall, choose something to build with your friend, and build it the best you can before the timer runs out. The person who builds it better wins! To start the timer, remove the wool from the bottom chest and put it in the top one. The chest has enough wool to make the timer last 7 minutes. If you want to add or subtract time, just add/remove some blocks from the chest. 1 stack = 30 seconds. If you don't like something about the timer, like it giving you an unlimited jump and speed boost, just go to the timer's redstone and remove the respective command blocks. I've labeled them for your ease. If the timer somehow breaks, try removing the Redstone block in the timer and placing it one block away from the front of the sticky piston. If that doesn't work, learn Redstone. I've kept the building and Redstone to a bare minimum to reduce lag on lower-end computers. I've tested this map on my school Chromebook through Eaglercraft 1.5.2 and gotten a pretty consistent 40-60 FPS, even when opened to LAN with 2 more people in the world. My Chromebook specs are 8 GB RAM and Intel® Celeron® N5100 Processor (1.10 GHz, up to 2.80 GHz Burst, 4 Cores, 4 Threads, 4 MB Cache).