GREAT FIND!
If that left side goes down to the ground (that's open in the picture above), you've got your ramp for your hens! Just put a few pieces of scrap to use as 'steps' so the hens can get some traction if it's raining....and viola, one chicken ramp!
I see you're in Alberta, so yes, I'd probably retro-fit a piece of plywood to fit inside the front doors - but leaving a 'window' cut into the plywood for ventilation (perhaps more like a slit at the top). However, you're in warm enough summertimes to leave the existing hardware cloth as is, so you have the best of both worlds. (Using window sash closures would allow the piece of plywood to fit over the existing hardware cloth during wintertime, take plywood off for summertime).
Perhaps using the space underneath the enclosure as the place for food and water will provide you with more 'interior' space for roosting and dust bathing (if using pine shavings in bottom). I'd likely make a roost bar that is attached to the right side of the coop, and is suspended from the ceiling with a brace or bracket so there is more room to get around (you and the hens).
One other thing I'd think about (in a more snowy climate) is using plywood around the three sides of the base (a door along the back large edge), so winter winds don't knock over the food, should you decide to put it down there.
Have fun!