Hi Joshua,
I plan to grow-out 6
BB Whites in my 8'x6'
chicken tractor. It is only 2' high when in "chicken mode" but I'm building a wedge-shaped piece to add in once they need the extra head space. It will be my first year using it so I can't offer any advice from experience but I can post some updates as the summer goes on since they're arriving tomorrow.
My friend is a professional farmer and he grows out 100 BB Whites using electric poultry netting and a towable roosting
shelter. It's essentially a tin roof, a solid back wall and wire walls on each side with house wrap over the wire and an open front. He moves the whole operation to fresh ground every 2 weeks IIRC. He's been using that setup successfully for 3 years now so I can try to snap a pic next time I'm over.