Seems you are 29 inches high and 34 inches deep. How wide is the fireplace opening? I can envision nothing but problems with a freestanding stove inside the fireplace opening. To me, your only options are a stove on a new hearth in front of the chimney, or an insert. Personally, I think a floor hearth would look much better if it were the width of the entire chimney. This would also give you an area to stack wood, keep tools. Heating 24/7 you need somewhere to keep a bit of wood inside, even if just enough for 24 hours when the weather is bad. You look really limited on space between the chimney and wall on one side. What is the distance there? Would a full length hearth make it impossible to reasonably negotiate that edge of the chimney? Personally, I'd get the best insert I could find that would fit in that fireplace. You just lose too great a percentage of your living space otherwise. Especially given that you need to store camping gear in the living space. I'd definitely be going insert. You re going to need to burn one at near max capacity when the weather is cold and especially cold and windy, as you will have terrific heat loss. But probably less than you have now with a fireplace. Lots of heat loss through the walls, more as the temperatures get colder. Get the biggest best insert you can find. Suggestions along this line from hearth members with experience with inserts? We need to get width from him, but height is 29 inches, depth 34 inches. Good luck, and welcome!