You must use a standard 8 foot long 'store bought' type 2x4 (also known as a tubafor). If you can buy a purpleheart 2x4 locally then you can use it. Otherwise, you're probably limited to pine and fir. You can embellish your project with up to 25% of other stuff, but NOT OTHER WOODS. Only the wood from the 2x4 can be used. That means no plywood (unless you've found an 8 foot plywood 2x4). Categories are different for this challenge. Since this is the fifth year for our 2x4 Challenge the categories continue to be: Most Imaginative, Most Technically Challenging, and Most Utilitarian (meaning you can actually use the item for what it was designed for). You still have to declare your category.
For 2x4 Challenge rules click the 'read more'.