We followed the plans for the A-frame chicken coop very closely, and then modified it a bit at the end.
1. Trim was added to two doors on each side, as suggested. They are secured with latches at the top, more to keep them from falling open than to keep critters from getting in. We used 2x4x10's instead of 2x4x8's on the middle horizontal rail, giving us foot-long handles on each side. My husband and I are able to move the coop about 15 feet at a time, which is pretty good considering it is STURDY!
2. We used 1/2" galvanized hardware cloth instead of chicken wire, as suggested by one commenter (and lots of others in blogland).
3. I cut 1/4" plywood to fit the loft space and coated it with vinyl stick-on tile. This should make it easier to clean. We didn't screw down the plywood, so if we have to, we can remove it to hose it off/scrub it.
4. I cut a triangle of plywood to make an egg door at the end of the roost. It hinges at the bottom (with a 2x4 ripped into a 1x4 to cover the hardware cloth and provide a mounting spot for hinges) and latches at the top. I plan to use cotter pins or something to secure the latch. There is also a piece of untreated 1x4 held in place with tabs at the egg door to prevent bedding from falling out once it's converted to the nesting box (I'm planning to get pullets, not ready to lay yet, so they won't even have a tempting nest box)
5. There was no bottom door in the plans (to allow free-ranging), so I cut a piece of 2x4 to make a triangle against the bottom (same size as the egg door). It folds out (just like the egg door) and will allow the chickens easy access to the yard. We do have hawks in our neighborhood so free time will always be supervised. We also have a dog (who I coaxed into the coop for the main picture, haha!) who will need supervising. She's been around chickens before but you never know what will make her turn on them!
6. There was also no roost in the plans (although if you look at Ana's coop, there is a 2x4 across the middle of the side walls). I had a leftover closet rod, so I mounted that in the covered section parallel to the ladder. The ladder was shifted to the side. For the ladder, I just used a piece of cedar fencing and cut 2 48" dowels into 4 pieces each, and secured those with screws from the underside. I hope my chickens will be able to get up the ladder!
7. I also made a tube feeder from PVC and a dog bowl, and am working on a nipple waterer. Will update post when those are finished!
Now I just have to get some hens! I've been searching craigslist and can't wait!