I know what you mean about fearing the "coon feast"... several of our gals got out-- how long they were out we don't know-- but they came a running when I called them (phew! thank goodness!)
We have a neighbor too close to free range, and a very busy 55mph road up front--
chicken road pizza is NOT my idea of a good time!
Sure wish we could do it-- the grasshoppers here are taking over!
Whave a "playpen" we made to use while building a run-- and it could be used pretty long term if you need to.
1 100ft roll of 4 foot chickenwire ($30)
21 cheapo fence posts ($40)
Wire for attaching the fencin ($4)
1 large fishnet/stuffed-animal net from Goodwill ($5)
{you can use bird/deer netting for about $15-$20}
1 2' x 4' piece of plywood with 4 equally spaced holes drilled down one side and hole on the other.
measure-out a rectangle area whose sides equal a total of 101 linear feet. (extra 1' allows for a door!)
Push/pound-in the fence posts every 4-5 feet around the perimimeter of the rectangle.
at one end- put an extra post aproximately 21".
Dig a shallow 'trench" about an inch wide and several inches deep all the way around on the outside of the posts-close as to them as possible
Attach the fencing to the posts with wire so that a few inches at the bottom are in the trench. Replace the soil in the trench to secure the bottom of the fencing. It doesn't have to be real deep- because like in free-ranging, you'll take them into the coop at night.
For the door-- use the wire to attach the wood between the 2 posts that are 21" apart... On the other side of the wood with the one hole-- somply use the hole to wrap a piece of wire or rope thru the hole and around the post. Needs to be easily opened, but only by you - but not the chickies!
Cover the top with bird ,fish or deer netting-- not only keeps them IN but also keeps hawks etc OUT!
You can cover one end with a tarp if they are in an area without shade-- or add a couple wooden boxes or plastic bins with a chicken door cut in one end for shelter... when a hawk flies over-- WE know the net will keep it out--but the chickens don't-- so will want a place to hide!
Hope that'll help ya till you can get a more permanant run!