Hearth stone bennington + alcove = questions, help appreciated.

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I purchased a used in good condition bennington,beautiful stove. I have little experience beyond steel woodstove in garages. Either way, I'm looking to install this in the living room of my 2000sqft rancher.
I've studied this for months and the best solution is to build a addition or alcove off the gable end. The way the room is laid out this makes the most sense to me. I figure I can pour a pad, insulate underneath it use metal studs and a fireproof sheathing tiles ect. Inside. What backer board should be used in this setting?
Clearances for alcove in the manual are 48 inch max depth 24 min height 16 on sides. Thats with nfpa 211
I don't understand this. I can't find a list of materials that meets this qualification? When I Google it appears your buying an inspection.
Any help is greatly appreciated.
I'm going to attempt to post a pic of the spec page of manual

 

[Fire ring]

I purchased a used in good condition bennington,beautiful stove. I have little experience beyond steel woodstove in garages. Either way, I'm looking to install this in the living room of my 2000sqft rancher.
I've studied this for months and the best solution is to build a addition or alcove off the gable end. The way the room is laid out this makes the most sense to me. I figure I can pour a pad, insulate underneath it use metal studs and a fireproof sheathing tiles ect. Inside. What backer board should be used in this setting?
Clearances for alcove in the manual are 48 inch max depth 24 min height 16 on sides. Thats with nfpa 211
I don't understand this. I can't find a list of materials that meets this qualification? When I Google it appears your buying an inspection.
Any help is greatly appreciated.
I'm going to attempt to post a pic of the spec page of manual

 

[Fire ring]

 

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If the alcove is entirely non-combustible in construction then the clearances are not an issue. The clearances listed are to combustible surfaces. If you want to build the alcove conventionally with wood then you can put an NFPA 211 wall shielding on the back and side walls to reach that clearance. This article is about wall clearances.
https://www.hearth.com/talk/threads/wood-stove-wall-clearances-primer.147785/

 

[Fire ring]

Thank you for the info, do you know what tile backer is safe? Seems to still be up for debate from what I'm reading.

 

[begreen]

Most commonly used is Durock cement board.