Ok, here's a critique of the coop from someone who has no experience but has researched the snot out of keeping chickens...
First thing...how many chickens are you figuring on putting in there? You've got 12 sq ft to work with. Minimum square foot recommendation is 4 sq ft per large fowl bird, so according to that 3 birds could go fit. Folks state this is a guideline to use, but the 4 sq ft *is* stated as a minimum. Does Wisconsin have any bad weather where the birds will have to stay in the coop for more than a day?
Ventilation... A possible problem I see with the coop is that the only ventilation is apparently the pop door. The little bit of information in the ad states that the window is "fixed" which to me means it doesn't open. If you close the pop door at night it's gonna get mighty stuffy and humid in there.
Roost/nestboxes... The roosts are at the same height as the nestboxes...will the chickens roost on the roost pole or in the nestboxes? I'm betting on the nestboxes.
Pop door....9"x11", seems kinda on the small size but if you're getting bantams or small breeds then it should be ok.
I'm not trying to throw water on your plans, just some thoughts your way. The coop is "cute" and it has "amish workmanship" about it but I'm not so sure about it having "poultry workmanship"...the ventilation issue alone tells me someone was building a box to sell and wasn't considering the chickens' welfare. For $600 and some elbow grease you could have a very nice 4x8 coop (32sqft vs. 12sqft) if not an 8x8 one built out of new materials that you could stand up in and a decent run to go with it. Recycling building materials would bring the cost down greatly or let you build an even bigger coop.
Of course, I tend to be a bit utilitarian minded. Cute coop, though.
Best wishes on whichever direction you go with your coop!
Ed