Looks lovely!
I do have a couple of thoughts. First of all, consider adding roof overhangs. This will help keep the wood of your coop dry and help it last longer, and make leaks inside the coop less likely. I didn't put overhangs on all sides of my winter coop and I really regret it.
Second, consider making the access wall that opens (great idea, by the way) one of the walls outside the run, ideally the one on the side where your roof is higher. That way, you won't be standing in run off from the roof when you're tending to chickens on a rainy day. It's very nice not to have to go inside the run to get inside the coop.
Third, consider making the chicken pop door in the wall rather than the floor. If you put it in the floor, not only does it take up valuable floor space, but if you use shavings inside the coop they're going to be always falling down that door. You probably don't need a ramp unless your birds are very heavy breeds and poor fliers/jumpers. I have a pop door fashioned so that I can open and close it from the access door, with an inner sliding panel and an outer drop down door that my chickens use as a perch for ingress and egress (picture on my BYC page). Just remember to cut the door high enough above the floor level so shavings don't spill out of it, either.
The ramp up to the nesting box is also probably unnecessary, but you do need a roost! And consider a droppings board or tray under the roost, which makes cleanup much easier.
Add more ventilation at the tops of the walls. Figure 1 square foot of ventilation for every chicken you plan to have in there. You won't be sorry to have this much, but you may well be sorry if you have less...and are having to add more ventilation after you've built your coop.
I do have a couple of thoughts. First of all, consider adding roof overhangs. This will help keep the wood of your coop dry and help it last longer, and make leaks inside the coop less likely. I didn't put overhangs on all sides of my winter coop and I really regret it.
Second, consider making the access wall that opens (great idea, by the way) one of the walls outside the run, ideally the one on the side where your roof is higher. That way, you won't be standing in run off from the roof when you're tending to chickens on a rainy day. It's very nice not to have to go inside the run to get inside the coop.
Third, consider making the chicken pop door in the wall rather than the floor. If you put it in the floor, not only does it take up valuable floor space, but if you use shavings inside the coop they're going to be always falling down that door. You probably don't need a ramp unless your birds are very heavy breeds and poor fliers/jumpers. I have a pop door fashioned so that I can open and close it from the access door, with an inner sliding panel and an outer drop down door that my chickens use as a perch for ingress and egress (picture on my BYC page). Just remember to cut the door high enough above the floor level so shavings don't spill out of it, either.
The ramp up to the nesting box is also probably unnecessary, but you do need a roost! And consider a droppings board or tray under the roost, which makes cleanup much easier.
Add more ventilation at the tops of the walls. Figure 1 square foot of ventilation for every chicken you plan to have in there. You won't be sorry to have this much, but you may well be sorry if you have less...and are having to add more ventilation after you've built your coop.
