I don't quite get what you are trying to do,
But I will throw in a few words of advise, I may be barking up the wrong tree as like I said I don't quite get it!
Solid fuel fires get much hotter and throw out a lot more heat than your average gas/electric fire. If it was a stove they are rated.
You will have lots of things to consider, I.E. batterning out walls and plasterboarding! This could be a potential fire hazard if the right materials are not used. I'd be thinking more about rendering any uneven walls around these types of fires. The chimney will most probally need a stainless steel flue liner too.
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