You do but the hardware cloth is pretty simple and fast. Cover the top with metal for rain protection, shade and secure the top of the hardware cloth. The hard part is framing the ends and making the door. You can cheat and buy an extra cattle panel and cut it down for the back end.
Not a fan of metal sheds. They look trashy very quickly, are easily tossed around in a wind storm, are hot, hot, hot and will become even more structurally unsound the more holes you cut to improve ventilation.
Take that $500 and build an 8x8 hoop coop. Line it with hardware cloth and roof...