Camp Borden Ontario 1917.
Someone send me this pic just in time ,as I was starting to question my references on the window heights, especially the engine shop area.They looked a little high off the ground but this pic confirms they were meant for light not to be looked through.The roofing material is also interesting ,it looks like wood with tar covering the seams.
Other than a small area beside the road ,the other three sides of the hangars looks like a compacted material of some kind.