Modify an older heatalator style fireplace for a wood stoveH

[jubaru125]

I recently moved into an old (late 1700s) house which has an old fireplace. From my research it seems to be a hetalator style with metal surrounding the firebox. I'd like to modify it so that I can I can install a wood stove with a chimney liner. It looks like I will have to do some cutting at a minimum to get the damper out. I'm looking for any guidance here, especially so I don't create myself a problem.
would it be best to just cut the damper out and use an oval liner or cut further down and use the full round liner? I attached some pictures which show the current setup. I can provide additional pictures if needed. Any advice is appreciated.

Thank you

 

[begreen]

If this is a properly installed heatform style fireplace, then it's ok to cut out a section to clear the round liner after the damper is removed.

There are several past threads on this type of installation. Search on "heatform" to bring them up.

 

[stoveliker]

Do insulate the liner for both performance and safety.