On "build" day, you will need to bring the items shown on the Required Tools list, which will be sent to you shortly. Many folks will already have these common tools and bits in their garage, but if purchase is needed, the cost will be approximately $25-35.
In addition, you will need a large tarp, blanket or sheet to keep hardware and tools from getting lost in the grass. For your own personal protection, please bring a hat, protective eye wear. Optionally, you may want to wear work gloves.