I'm thinking 12 12 ft panels should be good for the catch pen. Plus 4 more for a 24 ft alley to load out or squeeze. And using the truck and trailer for a wing like you do Dave.
I did get to use the portable squeeze for the first time as portable today. Setting up some cows for AI, and spring work up. Have to refine our technique with the portable panels but it went relatively well. Dead eye got kicked once because he managed to let one slip by his side too close. Good lesson learned on his part today. A kind of badge of honor too