A coop built for 2 (Ducks and Chickens)

I recently was gifted 2 Magpie ducks they are a year old and I NEED to make them a home. I would also like to add 10 chickens/chicks this summer. I need something that can fit all of them any suggestions? I was going to make a tractor with a 4X8X8 coop attached to a 8X8 run but I am scared my yard tractor will not be strong enough to pull it. Do any of you have a suggestion on what I should do? I plan on letting them run the yard (3 fenced acres) but not for a month or 2 once they listen better and know home.