My run is made with a repurposed metal framework for a greenhouse. Actually, two. The one with the white roof is 10x10, the addition with the blue is 8x8. Nope, the roof lines don't match. Nope, I don't care. It was free.
One thing you need to think about is snow load in the winter. The white roof is polycarbonate sheets at $53 each, so not cheap. The blue is a cheap tarp over chicken wire. Both held up to our winter last year, very well. I did broom off the snow whenever we got more than an inch. I will probably cover the blue tarp with a better tarp for this winter. It's gotten some holes worn into it from rubbing against the chicken wire.
I have no idea what the metal framing would cost to buy new. My neighbor "just wanted that junk out of here," and gave it to me.
One thing you need to think about is snow load in the winter. The white roof is polycarbonate sheets at $53 each, so not cheap. The blue is a cheap tarp over chicken wire. Both held up to our winter last year, very well. I did broom off the snow whenever we got more than an inch. I will probably cover the blue tarp with a better tarp for this winter. It's gotten some holes worn into it from rubbing against the chicken wire.
I have no idea what the metal framing would cost to buy new. My neighbor "just wanted that junk out of here," and gave it to me.