I really like FTG-05s mod.! Have you considered getting into it this deep? Not cheap but very functional...you will need the largest stove you can possibly put there to try and off set heating costs...and wonder then if it will pay large enough dividends....what stove did you have in mind?
Sorry, just saw this post. I am looking at the Regency F5100 stove. It is pretty large and it has a pretty long burn time. However, it is only 80,000 btu. I am not set on this stove. In fact, I am still looking at free standing stoves. Of course, my wife likes the Vermont Casting stoves that are ceramic on the exterior. Not sure I am alright with them. My dad has a Vermont Castings insert, but it is the standard black, not ceramic. It has held up well.
https://www.regency-fire.com/en/Products/Wood/Wood-Stoves/F5100
I am open to all suggestions on free standing wood stoves, the higher the btu output, the better.
I will have to take a look at FTG=05's mod. No idea where to find it, but I'm going to start searching.