AART the chicken juggler has "nailed it", IMHO. HWC is the material that you pay for once and it keeps paying you back, well into the future. I go vertical, space studs at about 46 inch centers, use a screw and washer as a turnbuckle to make the hardware cloth tight and use largish gauge fencing "U" nails to fasten it to the studs. I go up and over the frame and down the other side, treating the stud spaces like panels. a skirt is a must. if you keep the wood off the ground and give the roof a good 10" eve, you will keep the rain off the wood and probably won't find a need for pressure treated lumber.
It's so tempting to find a cheaper way to do it, but there really doesn't seem to be a more hassle free approach long term. the vast, vast majority of sad stories that are posted here with respect to predator attacks would not happen if people went with decent gauge hardware cloth and made an impervious envelope. the heartache and headache just aren't worth the savings long term, IMHO.