I'd leave the doors so you can close off the front. That gives a storage area for feed, tools, and dry bedding and provides a place for you to be out of the weather when caring for and observing your birds - you'll be grateful for the protection in those cold, Nova Scotia winter winds!
Close off most of the shed by putting a kneewall (half-wall) of plywood across the bottom at the first set of studs (closest to the door) and down from the top to "square off" across the middle - then run as big a panel of hardware cloth as you can fit all the way across, above the kneewall.
Since your shed has a slanted dutch roof, side ventilation may be a challenge. If the roofline doesn't already have a peak vent, those are easy to add. You'll still need side ventilation, but you should be able to find ready-to-install ones at your local hardware store or mill. A less expensive option is a long, horizontal hardware cloth panel high up on the flat end. Make sure your vents are above the highest roosts. Drafts are fine above a sleeping chicken, but a problem when coming up from below. Add a chicken-door along the lower panel and voila! A great coop ready for customizing with whatever you want as roosts and poop boards!
A bonus consideration is to position your chicken door (and possibly the "people-doors) above the height you don't feel like shoveling snow ... a real back saver, come winter! And the one big thing I wish I'd considered when I revamped my playhouse chicken coop is to position a "trap door" somewhere on the side so I could maneuver a wheelbarrow to catch the old bedding ... maybe next year!