Coop Design Questions!!!!

It's my first time with chickens so I still need tips on the best coop and run designs. Right now I have a 4 x 2 coop with two 1 x 1 nestboxes attached to the side that is raised a foot above the ground. It has a pull-out wooden "tray" filled with pine shaving on the bottom and pull-out nestboxes so I can clean the pine shavings out. There is an opening in the back of the coop and a ramp going out into a 6 x 6 run area. I actually used to use the coop for quail a few years ago so I just took out all the wire sides and floor and replaced it with wood. I was wondering if there is a more sanitary, easy-to-clean design for a chicken coop and run because the smell is sort of trapped in the coop.  Even though the coop has a bunch of little cracks inbetween pieces of wood and the opening, the air doesn't really circulate. My local hatchery just keeps the chickens in a fenced run with a tin roof and nestboxes and covers it with plastic when it gets cold. They dont have a little shelter in there or anything. I was thinking about doing this becuase they get more fresh air and sunlight plus you don't get that blast of chicken smell that I get when I open the coop doors. It hardly smells at all. I was also wondering how many chickens I could fit in the run I have (36 sq. feet) if I move to my hatcheries design.

Really? I was told it would hold four easy by the people at my hatchery. I clean the shavings totally every weekend and do a small cleanout mid-week if it looks bad. I have no problem making it bigger when I remodel. I can get rid of this coop and add on a larger, half-enclosed shelter to one side of the run. I just want to see how much bigger I need to make it in order to get one more bird (a "fluffy" ameraucana). I have a silkie, a silkie/polish mix, an EE, and a speckled sussex at the moment. They are 3-4 months old.

Ok no problem I will work on getting that extended. At the moment they are all the size of bantams (of course the silkie is already bantam ) so i'll get the run bigger before they reach full size. How much would I have to extend it if I were to add another? (if I do it will be one of those new silkie ameraucanas)

Anyone know how big it should be for 5 pullets? Again right now I have a polish/silkie mix, a speckled sussex, an EE, and a silkie and may get a silkie ameraucana if it is not to much extra building.

I may need to downsize. You see I live in a no chicken neighborhood so I need to stay small. I guess I'll just have to stick with two or three.

Maybe i'll just wait until they get bigger to figure out what I need to do. What are the smallest types of chickens that I can get that are good layers?

Ok so I think my neighbor (unfortunately president of the HOA) figured out I have chickens in my backyard because he asked how our shed was coming along (we built it and it has been done for a long time so he definately wants to see whats going on). Our coop is next to our shed and we just built a fence on the side exposed to his house so he doesn't see them and it's less of a bother if he did figure out. So if he comes (I wont tell him he can't come) and says he wants the chickens gone even though he is pretty nice, I have a backup plan. There is a farm field behind my house and my neighbor knows the owner so I am going to ask her to lease/sell us a tiny bit of that field and we can have unlimited chickens!!!! Even if he doesn't say they have to go I would want to do that  But getting to the point I was wondering what the best coop design is for easy matinence. If we do go through with getting the land, I was thinking of having 6 chickens (though I wont make any promises ). Our coop design stinks right now in both ways so I need a better design from people with good experience.