Hello Ken and welcome to BYC, You found an Awesome poultry Forum to be a part of with many great knowledgeable members who are more then willing to jump in and help you with any questions you may have.
Hi Ken and welcome to BYC We're so happy you've decided to join us
For your tractor I would recommend an 8X8 constructed with 2X4s and 2x2s. Use hardware cloth and tin. Also put about three strands of hot wire around the base with a small solar energizer. You can raise up to 40 meat birds in that structure. So far I like McMurray the best for CX birds.