A good study:-- Jaqueline Hall. Architecture of the Drill Hall in Canada, 1863-1939: A Report Prepared for the Historic Sites and Monuments Board of Canada (Ottawa, 1989) is a good reference for the armoury construction program which produced many of our armouries. There was another study which dealt with armoury construction, but I do not have the specifics of the title, which I believe was "By Federal Design" and possibly produced by Public Works.
A quote from Hall:--
"In 1867, large battalion drill sheds designed to [Walter] Moberly's plan were erected in St Catharines, Simcoe, St. Thomas, PortHope, Prescott, Coburg, Peterborough, Bowmanville, Grimsby, Cornwall, Kingston, Brockville, Perth, Brantford, Chatham, Walkerton, Port Arthur, Barrie, Whitby and Stratford. Unfortunately, shortly after they were erected a number were either blown down or collapsed under the weight of snow. The seemingly obvious conclusion reached was that the wooden trusdses were not quite strong enough to withstand strong laterasl thrusts or great loads."