Unloaded, firearm locked in an locked sturdy, opaque container is all you need to meet the RCMP requirements to be legal. If you feel that you want to go further into theft prevention, have at it. There's nothing in the legal requirements for it to be in a bomb proof container. My Condor 42" rifle double rifle bag is what I use to carry my restricted in. If a zipper breaks and there isn't something to loop a padlock through, then I'll just use my knife and improvise since that bag will be tossed out anyway when I get home.
You think someone intent on stealing your guns is going to sit around for even a minute trying to break into your bag or hardcase? They'd walk in, pickup your case like it's their own and leave the range within 15 seconds THEN take their time trying to open your case when they get home.